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1. Search for Rare and Forbidden Charm Meson DecaysD0→Vℓ+ℓ−andhhℓℓ

Author: K. O'Shaughnessy, dos Reis Ac, K. C. Peng, A. K. Tripathi, S. M. Yang, N. R. Stanton, Alberto Santoro, A. J. Slaughter, A. Nguyen, P.A. Kasper, S. Yoshida, A. Napier, K. Denisenko, S. B. Bracker, A. Álvarez Fernández, M. Sheaff, S. Amato, D. Yi, D. C. Langs, R. Weiss-Babai, R. A. Burnstein, L. M. Cremaldi, E. Wolin, G. F. Fox, B. Quinn, A.B. d'Oliveira, A. Rafatian, E.M. Aitala, C. James, N. W. Reay, J. Leslie, N. Witchey, S. Takach, G. Hurvits, C. Zhang, S. Watanabe, de Mello Neto, M. V. Purohit, B. Lundberg, R. H. Milburn, H.S. Carvalho, A.K.S. Santha, A.M. Halling, S. Banerjee, Kevin Stenson, J. C. Anjos, J. A. Appel, R. A. Sidwell, J. Magnin, Sokoloff, R. Zaliznyak, D. J. Summers, K. Gounder, Daniel Ashery, T. Carter, A. J. Schwartz, D. A. Sanders, L. Perera, G. Blaylock, G. Herrera, K. Thorne, Simon Kwan, D. Mihalcea, S. Devmal, H. A. Rubin, S. Radeztsky, P. Gagnon, C. L. Darling, R. J. Stefanski, N. K. Copty, J. Solano, J. Wiener, J.J. Reidy, C. Göbel, S. MayTal-Beck, de Miranda Jm, B. T. Meadows, P. R. Burchat, and I. Bediaga
Subjects: Physics, Particle physics, Antiparticle, Muon, Meson, Neutral current, High Energy Physics::Phenomenology, General Physics and Astronomy, Nuclear physics, Pseudoscalar, High Energy Physics::Experiment, Vector meson, Charm (quantum number), Lepton
Abstract: We report results of a search for flavor-changing neutral current (FCNC), lepton flavor, and lepton-number violating decays of the ${D}^{0}$ (and its antiparticle) into three and four bodies. Using data from Fermilab charm hadroproduction experiment E791, we examine modes with two leptons (muons or electrons) and a ${\ensuremath{\rho}}^{0}$, ${\overline{K}}^{*0}$, or $\ensuremath{\varphi}$ vector meson or a nonresonant $\ensuremath{\pi}\ensuremath{\pi}$, $K\ensuremath{\pi}$, or $\mathrm{KK}$ pair of pseudoscalar mesons. No evidence for any of these decays is found. Therefore, we present branching-fraction upper limits at 90% confidence level for the 27 decay modes examined (18 new).
Published: 2001
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2. Study of theDs+→π−π+π+Decay and Measurement off0Masses and Widths

Author: G. F. Fox, D. J. Summers, K. Gounder, J. M. De Miranda, B. T. Meadows, M. D. Sokoloff, J. R. T. de Mello Neto, P.A. Kasper, S. B. Bracker, S. Radeztsky, S. Watanabe, J.J. Reidy, M. Sheaff, R. J. Stefanski, S. Devmal, R. A. Sidwell, S. Takach, B. Lundberg, I. Bediaga, C. Zhang, A. J. Slaughter, J. A. Appel, A. Napier, Daniel Ashery, K. Denisenko, P. Gagnon, A.M. Halling, D. Yi, K. C. Peng, H.S. Carvalho, S. M. Yang, A. Nguyen, A. Massafferri, H. A. Rubin, N. K. Copty, S. MayTal-Beck, R. Zaliznyak, Simon Kwan, S. Yoshida, A. K. Tripathi, D. C. Langs, M. V. Purohit, C. L. Darling, K. O'Shaughnessy, G. Blaylock, A.K.S. Santha, J. Solano, C. James, S. Amato, A.B. d'Oliveira, E.M. Aitala, Alberto Santoro, J. C. Anjos, N. W. Reay, J. Leslie, J. Magnin, D. A. Sanders, J. Wiener, L. Perera, D. Mihalcea, A. C. dos Reis, R. Weiss-Babai, A. Álvarez Fernández, L. M. Cremaldi, K. Thorne, Patricia R. Burchat, E. Wolin, S. Banerjee, N. Witchey, C. Göbel, A. J. Schwartz, R. H. Milburn, R. A. Burnstein, N. R. Stanton, A. Rafatian, G. Hurvits, Kevin Stenson, G. Herrera, T. Carter, and B. Quinn
Subjects: Physics, Crystallography, Particle physics, Pi, General Physics and Astronomy, Dalitz plot
Abstract: From a sample of $848\ifmmode\pm\else\textpm\fi{}44$ ${D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ decays, we find $\ensuremath{\Gamma}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+})/\ensuremath{\Gamma}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\varphi}{\ensuremath{\pi}}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.245\ifmmode\pm\else\textpm\fi{}{0.028}_{\ensuremath{-}0.012}^{+0.019}$. Using a Dalitz plot analysis of this three body decay, we find significant contributions from the channels ${\ensuremath{\rho}}^{0}(770){\ensuremath{\pi}}^{+}$, ${\ensuremath{\rho}}^{0}(1450){\ensuremath{\pi}}^{+}$, ${f}_{0}(980){\ensuremath{\pi}}^{+}$, ${f}_{2}(1270){\ensuremath{\pi}}^{+}$, and ${f}_{0}(1370){\ensuremath{\pi}}^{+}$. We also present the values obtained for masses and widths of the resonances ${f}_{0}(980)$ and ${f}_{0}(1370)$.
Published: 2001
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3. Experimental Evidence for a Light and Broad Scalar Resonance inD+→π−π+π+Decay

Author: N. R. Stanton, N. Witchey, D.C. Langs, S. Radeztsky, S. MayTal-Beck, A. Nguyen, Alberto Santoro, Kevin Stenson, J. Magnin, A.K. Tripathi, A.M. Halling, D. J. Summers, K. Gounder, R. H. Milburn, I. Bediaga, C. Zhang, R. A. Burnstein, J. A. Appel, G. F. Fox, S. M. Yang, S. Yoshida, P.A. Kasper, J.J. Reidy, A. Massafferri, A. Rafatian, J. Wiener, R. J. Stefanski, G. Blaylock, A. Napier, H.S. Carvalho, B. Lundberg, de Miranda Jm, K. Denisenko, D. Yi, Sokoloff, N. W. Reay, J. Leslie, G. Hurvits, C. Göbel, S. Takach, S. Watanabe, R. Weiss-Babai, B. T. Meadows, Daniel Ashery, M. Sheaff, C. L. Darling, S. B. Bracker, D. A. Sanders, A. J. Schwartz, Simon Kwan, Sudeshna Banerjee, J. C. Anjos, T. Carter, G. Herrera, P. Gagnon, C. James, R. Zaliznyak, N. K. Copty, S. Amato, B. Quinn, H. A. Rubin, de Mello Neto, J. Solano, D. Mihalcea, A. J. Slaughter, M. V. Purohit, A.K.S. Santha, K. O'Shaughnessy, dos Reis Ac, S. Devmal, L.P. Perera, R. A. Sidwell, Patricia R. Burchat, A.B. d'Oliveira, E.M. Aitala, A. Álvarez Fernández, L. M. Cremaldi, E. Wolin, K. C. Peng, and K. Thorne
Subjects: Physics, Nuclear magnetic resonance, Amplitude, Scalar (mathematics), Analytical chemistry, Pi, General Physics and Astronomy, Dalitz plot, Resonance
Abstract: From a sample of 1172 +/- 61 D(+)-->pi(-)pi(+)pi(+) decays, we find gamma(D(+)-->pi(-)pi(+)pi(+))/gamma(D(+)-->K-pi(+)pi(+)) = 0.0311 +/- 0.0018(+0.0016)(-0.0026). Using a coherent amplitude analysis to fit the Dalitz plot of these decays, we find strong evidence that a scalar resonance of mass 478(+24)(-23) +/- 17 MeV/c(2) and width 324(+42)(-40) +/- 21 MeV/c(2) accounts for approximately half of all decays.
Published: 2001
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4. Asymmetries in the production of Λc+ and Λc− baryons in 500 GeV/c π− nucleon interactions

Author: S. M. Yang, R. A. Burnstein, Kevin Stenson, S. Yoshida, A. Rafatian, C. Zhang, H.S. Carvalho, N. Witchey, M. V. Purohit, A. Nguyen, K. C. Peng, A.B. d'Oliveira, A. Fernandez, D.C. Langs, S. MayTal-Beck, B. Quinn, J. R. T. de Mello Neto, A.K.S. Santha, E.M. Aitala, A. Napier, K. Denisenko, D. Yi, R. Weiss-Babai, G. Hurvits, R. A. Sidwell, D. A. Sanders, R. J. Stefanski, N. K. Copty, A.K. Tripathi, I. Bediaga, G. Blaylock, K. Thorne, J. C. Anjos, A. J. Slaughter, T. Carter, L. M. Cremaldi, E. Wolin, D. Mihalcea, S. B. Bracker, N. R. Stanton, F.R.A. Simão, A. C. dos Reis, J. Magnin, A. J. Schwartz, C. L. Darling, J.J. Reidy, B. Lundberg, B. T. Meadows, R. Zaliznyak, M. Sheaff, M. D. Sokoloff, G. Herrera, P.A. Kasper, Sudeshna Banerjee, S. Devmal, P. R. Burchat, D. J. Summers, R. H. Milburn, L.P. Perera, K. Gounder, K. O'Shaughnessy, J. M. De Miranda, Alberto Santoro, J. Solano, Daniel Ashery, S. Amato, G. F. Fox, H. A. Rubin, S. Takach, S. Radeztsky, S. Watanabe, A.M. Halling, Simon Kwan, P. Gagnon, C. James, J. A. Appel, N. W. Reay, J. Leslie, J. Wiener, and C. Göbel
Subjects: Physics, Nuclear and High Energy Physics, media_common.quotation_subject, Lambda, Asymmetry, Baryon, Nuclear physics, symbols.namesake, Pi, symbols, Feynman diagram, Production (computer science), Fermilab, Nucleon, media_common
Abstract: We present a measurement of asymmetries in the production of Λ c + and Λ c − baryons in 500 GeV/ c π − -nucleon interactions from the E791 experiment at Fermilab. The asymmetries were measured as functions of Feynman x ( x F ) and transverse momentum squared ( p T 2 ) using a sample of 1 819±62 Λ c 's observed in the decay channel Λ c + → pK − π + . We observe more Λ c + than Λ c − baryons, with an asymmetry of (12.7±3.4±1.3)% independent of x F and p T 2 in our kinematical range (−0.1⩽ x F ⩽0.6 and 0.0⩽ p T 2 ⩽8.0 (GeV/ c ) 2 ). This Λ c asymmetry measurement is the first with data in both the positive and negative x F regions.
Published: 2000
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5. Asymmetries in the production of Λ0, Ξ−, and hyperons in 500 GeV/c π−–nucleon interactions

Author: J. A. Appel, Michael Sokoloff, K. O'Shaughnessy, A. Napier, P.A. Kasper, A.B. d'Oliveira, E.M. Aitala, K. Denisenko, D. Yi, R. Weiss-Babai, C. James, R. Zaliznyak, S. Devmal, B. Quinn, G. Blaylock, A.J. Slaughter, A. J. Schwartz, C. L. Darling, S. Takach, A. Rafatian, L.P. Perera, K. C. Peng, S. B. Bracker, N. Witchey, J. R. T. de Mello Neto, J. Wiener, J.J. Reidy, G. Hurvits, Milind Purohit, I. Bediaga, Don Summers, A. Fernandez, D.C. Langs, R. A. Sidwell, B. Lundberg, C. Göbel, C. Zhang, A.K.S. Santha, L. M. Cremaldi, D. Ashery, E. Wolin, A. Nguyen, S. MayTal-Beck, H. A. Rubin, Kevin Stenson, M. Sheaff, N. R. Stanton, J. C. Anjos, T. Carter, A.K. Tripathi, R. H. Milburn, Alberto Santoro, F.R.A. Simão, N. K. Copty, Brian Meadows, Patricia R. Burchat, A. C. dos Reis, K. Thorne, J. Solano, G. Herrera, S. Yoshida, H.S. Carvalho, N. W. Reay, J. Leslie, Simon Kwan, David Sanders, P. Gagnon, K. Gounder, J. M. De Miranda, S. Radeztsky, A.M. Halling, J. Magnin, R.A. Burnstein, Sudeshna Banerjee, S. Amato, G. F. Fox, and S. Watanabe
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Astrophysics::Cosmology and Extragalactic Astrophysics, Asymmetry, Nuclear physics, Baryon, symbols.namesake, Transverse momentum, symbols, Feynman diagram, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, Nucleon, media_common
Abstract: We present a measurement of asymmetries in the production of Λc+ and Λc− baryons in 500 GeV/c π−-nucleon interactions from the E791 experiment at Fermilab. The asymmetries were measured as functions of Feynman x (xF) and transverse momentum squared (pT2) using a sample of 1 819±62 Λc's observed in the decay channel Λc+→pK−π+. We observe more Λc+ than Λc− baryons, with an asymmetry of (12.7±3.4±1.3)% independent of xF and pT2 in our kinematical range (−0.1⩽xF⩽0.6 and 0.0⩽pT2⩽8.0 (GeV/c)2). This Λc asymmetry measurement is the first with data in both the positive and negative xF regions.
Published: 2000
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6. Correlations between D and $${\overline D}$$ mesons produced in 500 GeV/cπ−-nucleon interactions

Author: D. Ashery, Patricia R. Burchat, S. Radeztsky, K. O'Shaughnessy, J. A. Appel, J.J. Reidy, H.S. Carvalho, A.M. Halling, K. Gounder, J. M. De Miranda, B. Lundberg, A.B. d'Oliveira, David Sanders, C. Göbel, E.M. Aitala, K. C. Peng, Kevin Stenson, G. Blaylock, Don Summers, C.J. Solano Salinas, L.P. Perera, R.A. Burnstein, K. Thorne, S. Takach, Milind Purohit, I. Bediaga, Sudeshna Banerjee, S. MayTal-Beck, L. M. Cremaldi, E. Wolin, J. R. T. de Mello Neto, A.K.S. Santha, A. Napier, K. Denisenko, S. Amato, D. Yi, A.J. Slaughter, A.K. Tripathi, R. Weiss-Babai, G. F. Fox, J. C. Anjos, H. A. Rubin, D. Mihalcea, R. A. Sidwell, S. Watanabe, A. Nguyen, B. Quinn, S. M. Yang, C. Zhang, A. C. dos Reis, R. J. Stefanski, S. Yoshida, T. Carter, N. Witchey, A. Fernandez, D.C. Langs, M. Sheaff, Sokoloff, N. K. Copty, N. R. Stanton, C. James, Stephen B. Bracker, J. Wiener, R. Zaliznyak, P.A. Kasper, Simon Kwan, P. Gagnon, N. W. Reay, J. Leslie, C. L. Darling, A. Rafatian, G. Hurvits, Alberto Santoro, Brian Meadows, R. H. Milburn, A. J. Schwartz, and G. Herrera
Subjects: Physics, Quantum chromodynamics, Particle physics, Meson, High Energy Physics::Phenomenology, Order (ring theory), Nuclear physics, D meson, High Energy Physics::Experiment, Production (computer science), Charm (quantum number), Nuclear Experiment, Nucleon, Event generator
Abstract: We present a study of correlations between D and $${\overline D}$$ mesons produced in 500 GeV/cπ−-nucleon interactions, based on data from experiment E791 at Fermilab. We have fully reconstructed 791 ± 44 charm meson pairs to study correlations between the transverse and longitudinal momenta of the two D mesons and the relative production rates for different types of D meson pairs. We see slight correlations between the longitudinal momenta of the D and the $${\bar D}$$ , and significant correlations between the azimuthal angle of the D and the $${\bar D}$$ . The experimental distributions are compared to a next-to-leading-order QCD calculation and to predictions of the PYTHIA/JETSET Monte Carlo event generator. We observe less correlation between transverse momenta and different correlations between longitudinal momenta than these models predict for the default values of the model parameters. Better agreement between data and theory might be achieved by tuning the model parameters or by adding higher order perturbative terms, thus contributing to a better understanding of charm production. The relative production rates for the four sets of charm pairs, $$D^0{{\overline D}^0}, D^0 D^{-}, D^+{{\overline D}^0}, D^+ D^{-}$$ as calculated in the PYTHIA/JETSET event generator with the default parameters, agree with data as far as the relative ordering, but predict too many $$D^+ {{\overline D}^0}$$ pairs and too few $$D^+ D^{-}$$ pairs.
Published: 2000
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7. Multidimensional resonance analysis of Λc+→pK−π+

Author: E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, S. Devmal, A. Fernandez, G.F. Fox, P. Gagnon, C. Gobel, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, J. Magnin, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, D. Mihalcea, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, D.A. Sanders, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, J. Solano, N.R. Stanton, R.J. Stefanski, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, S.M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang
Subjects: Baryon, Physics, Nuclear and High Energy Physics, Particle physics, Amplitude, Resonance analysis, Pi, Resonance, Lambda, Bar (unit)
Abstract: We present the results of a five-dimensional resonant amplitude analysis of the $\Lambda_c^+{\to}pK^{-}\pi^{+}$ system based on $946\pm 38$ reconstructed decays. These data were produced in 500 GeV/$c$ $\pi^-$-N interactions by Fermilab experiment E791. We report measurements of the amplitudes for $\Lambda_c^+$ decay into nonresonant $pK^-\pi^+$ and to $p\bar{K}^{*0}(890)$, $\Delta^{++}(1232)K^-$, and $\Lambda(1520)\pi^+$ and we comment on other possible resonant enhancements. This is the first complete amplitude analysis of the $\Lambda_c^{+}{\to}pK^{-}\pi^{+}$ system. We find that $(54.8\pm5.5\pm3.5)$% of the decays are nonresonant, $(19.5\pm2.6\pm1.8)$% of the decays are via the $\bar{K}^{*0}$ resonance, $(18.0\pm2.9\pm2.9)$% of the decays are via the $\Delta^{++}$ resonance, and $(7.7\pm1.8\pm1.1)$% of the decays are via the $\Lambda(1520)$ resonance. We find evidence for an increasingly negative polarization of the $\Lambda_c^+$ baryons as a function of $p_T^2$, in agreement with a recent model\cite{dha} and with a related measurement\cite{jez}.
Published: 2000
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8. Measurement of the form-factor ratios for D+s→φℓ+νℓ

Author: E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, G.F. Fox, P. Gagnon, C. Gobel, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, D. Mihalcea, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, D.A. Sanders, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, J. Solano, N.R. Stanton, R.J. Stefanski, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, S.M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Electron channel, Form factor (quantum field theory), Lepton
Abstract: We have measured the form factor ratios r_V = V(0)/A_1(0) and r_2 = A_2(0)/A_1(0) for the decay D_s^+ -> phi ell^+ nu_ell, phi -> K^+ K^-, using data from charm hadroproduction experiment E791 at Fermilab. Results are based on 144 signal and 22 background events in the electron channel and 127 signal and 34 background events in the muon channel. We combine the measurements from both lepton channels to obtain r_V = 2.27 +- 0.35 +- 0.22 and r_2 = 1.57 +- 0.25 +- 0.19.
Published: 1999
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9. Search for the pentaquark via the decay

Author: R. Zaliznyak, Sudeshna Banerjee, A. Napier, K. Denisenko, T. Carter, J.J. Reidy, D. Yi, J. A. Appel, R. Weiss-Babai, S. Takach, L.P. Perera, A. J. Schwartz, S. Amato, S. Radeztsky, Simon Kwan, G. F. Fox, P.A. Kasper, N. Witchey, S. M. Yang, L. M. Cremaldi, I. Bediaga, E. Wolin, S. MayTal-Beck, A. Fernandez, S. Yoshida, D.C. Langs, S. Gerzon, A.K. Tripathi, G. Herrera, J. Lichtenstadt, S. Watanabe, D. J. Summers, K. Gounder, P. Gagnon, J. M. De Miranda, A. J. Slaughter, B. T. Meadows, M. D. Sokoloff, P. R. Burchat, K. O'Shaughnessy, Kevin Stenson, R. A. Sidwell, R. J. Stefanski, N. W. Reay, J. Leslie, S. B. Bracker, Alberto Santoro, B. Quinn, M. V. Purohit, A.M. Halling, J. C. Anjos, H.S. Carvalho, D. Mihalcea, A.K.S. Santha, J. R. T. de Mello Neto, E.M. Aitala, K. C. Peng, Daniel Ashery, R. A. Burnstein, B. Lundberg, A. C. dos Reis, A. Rafatian, G. Hurvits, H. A. Rubin, N. K. Copty, J. Solano, J. Wiener, C. Göbel, C. Zhang, C. James, M. Sheaff, A. Nguyen, D. A. Sanders, K. Thorne, G. Blaylock, R. H. Milburn, N. R. Stanton, A. B. D'Oliveira, and C. L. Darling
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Branching fraction, Fermilab, Beam (structure), Pentaquark
Abstract: We have searched for evidence of the production and decay of a neutral bound-state pentaquark, one of a predicted doublet of states: P 0 c s =| c suud〉 and P − c s =| c sddu〉 . Specifically, we have searched for the decay P 0 c s →K ∗0 K − p in data from Fermilab experiment E791, in which a 500 GeV/c π− beam interacted with nuclear targets. We find mass-dependent upper limits at the 90% confidence level for the ratio of cross section times branching fraction of this decay relative to that for the decay D s − →K ∗0 K − . The upper limits vary between 0.016 and 0.036 for M(P 0 c s ) between 2.75 and 2.91 GeV/c2, assuming a pentaquark lifetime of 0.4 ps.
Published: 1999
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10. Measurement of the Ds lifetime

Author: E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, G.F. Fox, P. Gagnon, C. Gobel, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, D. Mihalcea, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, D.A. Sanders, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, J. Solano, N.R. Stanton, R.J. Stefanski, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, S.M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang
Subjects: Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Particle physics, Meson, Maximum likelihood, FOS: Physical sciences, Charm (quantum number), Fermilab, Measure (mathematics), Standard deviation, High Energy Physics - Experiment
Abstract: We report the results of a precise measurement of the Ds meson lifetime based on 1662 +/- 56 fully reconstructed Ds -> phi pi decays, from the charm hadroproduction experiment E791 at Fermilab. Using an unbinned maximum likelihood fit, we measure the Ds lifetime to be 0.518 +/- 0.014 +/- 0.007 ps. The ratio of the measured Ds lifetime to the world average D0 lifetime is 1.25 +/- 0.04. This result differs from unity by six standard deviations, indicating significantly different lifetimes for the Ds and the D0., 12 pages, 3 figures, 2 table. LaTeX
Published: 1999
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11. Measurement of the form-factor ratios for D→ℓν

Author: N. R. Stanton, S. Takach, A. Napier, K. Denisenko, D. Yi, R. Weiss-Babai, B. Lundberg, S. B. Bracker, S. M. Yang, S. Radeztsky, G. Blaylock, R. Zaliznyak, K. C. Peng, S. Yoshida, J.J. Reidy, Simon Kwan, J. R. T. de Mello Neto, R. H. Milburn, A.B. d'Oliveira, E.M. Aitala, P.A. Kasper, C. Zhang, D. C. Langs, D. J. Summers, K. Gounder, B. T. Meadows, A. Álvarez Fernández, J. M. De Miranda, Kevin Stenson, M. D. Sokoloff, L. M. Cremaldi, E. Wolin, S. MayTal-Beck, S. Amato, R. J. Stefanski, Pauline Gagnon, N. K. Copty, A. J. Slaughter, T. Carter, A. Nguyen, J. Wiener, R. A. Sidwell, S. Banerjee, C. Göbel, D. Mihalcea, C. James, A.M. Halling, J. A. Appel, A. C. dos Reis, M. V. Purohit, J. Solano, G. F. Fox, B. Quinn, D. A. Sanders, Daniel Ashery, I. Bediaga, A.K.S. Santha, S. Watanabe, N. W. Reay, J. Leslie, L. Perera, N. Witchey, C. L. Darling, K. Thorne, Patricia R. Burchat, R. A. Burnstein, A. Rafatian, G. Hurvits, K. O'Shaughnessy, Alberto Santoro, M. Sheaff, H. A. Rubin, H.S. Carvalho, J. C. Anjos, A. J. Schwartz, G. Herrera, and A. K. Tripathi
Subjects: Physics, Nuclear and High Energy Physics, chemistry, Analytical chemistry, chemistry.chemical_element, Platinum, Carbon
Published: 1998
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12. Branching fractions for D0→K+K− and D0→π+π−, and a search for CP violation in D0 decays

Author: N. Witchey, Simon Kwan, A. Fernandez, A. Nguyen, S. B. Bracker, Don Summers, P.A. Kasper, P. Gagnon, R. Zaliznyak, J. A. Appel, A. K. Tripathi, J. R. T. de Mello Neto, L.P. Perera, J.J. Reidy, A.J. Schwartz, N.J. Copty, S. Radeztsky, C. Zhang, Kevin Stenson, K. C. Peng, D. C. Langs, D. Ashery, A. Napier, R. A. Sidwell, Michael Sokoloff, K. O'Shaughnessy, K. Denisenko, A.M. Halling, S. MayTal-Beck, D. Yi, Alberto Santoro, S. Takach, A.B. d'Oliveira, R. Weiss-Babai, E.M. Aitala, T. Carter, Brian Meadows, C. L. Darling, M. Sheaff, G. Blaylock, Patricia R. Burchat, N. W. Reay, J. Leslie, A.K.S. Santha, K. Thorne, L. M. Cremaldi, E. Wolin, A. Rafatian, R.A. Burnstein, J. C. Anjos, Sudeshna Banerjee, David Sanders, G. Hurvits, J. Solano, S. Amato, K. Gounder, G. F. Fox, J. M. De Miranda, Milind Purohit, I. Bediaga, R. H. Milburn, S. Watanabe, B. Quinn, H. A. Rubin, J. Wiener, B. Lundberg, C. Göbel, C. James, G. Herrera, N. R. Stanton, H.S. Carvalho, A.J. Slaughter, S. Yoshida, and A. C. dos Reis
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, CP violation, Fermilab, Charm (quantum number), Branching (polymer chemistry), Asymmetry, High Energy Physics - Experiment, media_common
Abstract: Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we have measured ratios of branching fractions for the two-body singly-Cabibbo-suppressed charged decays of the D0: (D0 -> KK)/(D0 -> Kpi) = 0.109 +- 0.003 +- 0.003, (D0 -> pipi)/(D0 -> Kpi) = 0.040 +- 0.002 +- 0.003, and (D0 -> KK)/(D0 -> pipi) = 2.75 +- 0.15 +- 0.16. We have looked for differences in the decay rates of D0 and D0bar to the CP eigenstates K+K- and pi+pi-, and have measured the CP asymmetry parameters A_CP(K+K-) = -0.010 +- 0.049 +- 0.012 and A_CP(pi+pi-) = -0.049 +- 0.078 +- 0.030, both consistent with zero., Comment: 10 Postscript pages, including 2 figures. Submitted to Phys. Lett. B
Published: 1998
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13. Study of the decay D0→K−K+π−π+

Author: Daniel Ashery, L. M. Cremaldi, E. Wolin, H. A. Rubin, M. V. Purohit, A.K.S. Santha, M. Sheaff, A.B. d'Oliveira, K. O'Shaughnessy, E.M. Aitala, A. J. Slaughter, J. R. T. de Mello Neto, N. K. Copty, I. Bediaga, P.A. Kasper, A. Napier, S. MayTal-Beck, C. James, K. C. Peng, N. W. Reay, J. Leslie, K. Denisenko, D. Yi, C. Zhang, D. J. Summers, K. Gounder, A.M. Halling, L.P. Perera, Kevin Stenson, R. Weiss-Babai, D. C. Langs, J. M. De Miranda, S. Yoshida, B. Quinn, B. T. Meadows, J. A. Appel, J. Solano, R. A. Sidwell, M. D. Sokoloff, S. B. Bracker, P. R. Burchat, G. F. Fox, H.S. Carvalho, N. Witchey, R. H. Milburn, A. Fernandez, R. Zaliznyak, A. C. dos Reis, A.J. Schwartz, B. Lundberg, Simon Kwan, J.J. Reidy, T. Carter, S. Watanabe, P. Gagnon, J. Wiener, A. K. Tripathi, C. Göbel, Sudeshna Banerjee, C. L. Darling, G. Herrera, S. Amato, S. Radeztsky, S. Takach, Alberto Santoro, R. A. Burnstein, A. Rafatian, G. Hurvits, D. A. Sanders, K. Thorne, A. Nguyen, N. R. Stanton, J. C. Anjos, and G. Blaylock
Subjects: Physics, Nuclear and High Energy Physics, Amplitude, Branching fraction, Analytical chemistry, Fermilab, Measure (mathematics)
Abstract: Using data from Fermilab fixed-target experiment E791, we measure the branching ratio for D 0 → K − K + π − π + and its resonant components. We find Γ(D 0 →K − K + π − π + ) Γ(D 0 →K − π + π − π + ) =(3.13±0.37±0.36) %. A coherent amplitude analysis is used to estimate the resonant components. We measure the ratios Γ(D 0 →f) Γ(D 0 →K − π + π − π + ) to be (2.0±0.9±0.8)% for f = φρ 0 , (0.9±0.4±0.5)% for f = φπ + π − , f=K ∗0 (892) K ∗0 (892) , and f= K ∗0 (892)K + π − or K ∗0 (892)K − π + .
Published: 1998
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14. Measurement of the Form-Factor Ratios forD+→K¯*0e+νe

Author: N. R. Stanton, N. K. Copty, C. Zhang, P.A. Kasper, D. Mihalcea, Kevin Stenson, A. K. Tripathi, A. C. dos Reis, S. MayTal-Beck, J. Solano, A. J. Slaughter, R. H. Milburn, B. T. Meadows, M. D. Sokoloff, G. P. Gagnon, J. R. T. de Mello Neto, P. R. Burchat, Daniel Ashery, J. Wiener, A. Napier, K. Denisenko, N. W. Reay, J. Leslie, S. Yoshida, K. C. Peng, B. Quinn, D. Yi, D. C. Langs, I. Bediaga, H. A. Rubin, R. Weiss-Babai, D. J. Summers, C. James, K. Gounder, N. Witchey, Simon Kwan, M. V. Purohit, J. M. De Miranda, J.J. Reidy, K. O'Shaughnessy, A.K.S. Santha, S. Banerjee, H.S. Carvalho, Alberto Santoro, J. C. Anjos, A. Álvarez Fernández, B. Lundberg, R. A. Burnstein, L. M. Cremaldi, M. Sheaff, J. A. Appel, E. Wolin, D. A. Sanders, G. Blaylock, A. Rafatian, G. Hurvits, T. Carter, C. L. Darling, R. A. Sidwell, L. Perera, A. J. Schwartz, S. B. Bracker, A.B. d'Oliveira, E.M. Aitala, K. Thorne, S. Takach, S. Radeztsky, A. Nguyen, G. Herrera, S. Amato, A.M. Halling, G. F. Fox, S. Watanabe, and R. Zaliznyak
Subjects: Physics, Particle physics, General Physics and Astronomy, Electron neutrino
Abstract: We present a measurement of the form-factor ratios r_V=V(0)/A_1(0) and r_2=A_2(0)/A_1(0) for the decay D^+ -> \overline K^{*0} e^+ \nu_e. The measurement is based on a signal of approximately 3000 $D^+ -> \overline K^{*0} e^+ \nu_e, \overline K^{*0} -> K^-\pi^+$ decays reconstructed in data from charm hadroproduction experiment E791 at Fermilab. The results are r_V = 1.84 +- 0.11 +- 0.08 and r_2 = 0.71 +- 0.08 +- 0.09.
Published: 1998
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15. Search forD0−D0mixing and doubly-Cabibbo-suppressed decays of theD0in hadronic final states

Author: A. Nguyen, L.P. Perera, B. Lundberg, Simon Kwan, P. Gagnon, D. C. Langs, A. Napier, D. Yi, R. Weiss-Babai, Daniel Ashery, C. L. Darling, Milind Purohit, I. Bediaga, C. Zhang, M. Sheaff, A.M. Halling, A.K.S. Santha, A.B. d'Oliveira, E.M. Aitala, Alberto Santoro, H. A. Rubin, N. W. Reay, J. Leslie, K. C. Peng, N. Witchey, N. K. Copty, S. Takach, T. Carter, S. Yoshida, R. Zaliznyak, R. H. Milburn, K. O'Shaughnessy, B. T. Meadows, A. J. Schwartz, K. Thorne, J. A. Appel, A. Álvarez Fernández, M. D. Sokoloff, P. R. Burchat, P.A. Kasper, D. J. Summers, J. C. Anjos, G. Herrera, K. Gounder, J. M. De Miranda, S. B. Bracker, L. M. Cremaldi, E. Wolin, R. A. Sidwell, S. Watanabe, H.S. Carvalho, B. Quinn, R. A. Burnstein, Sudeshna Banerjee, C. James, A. J. Slaughter, A. Rafatian, S. Radeztsky, G. Hurvits, S. Amato, J. R. T. de Mello Neto, Kevin Stenson, A. C. dos Reis, J. Wiener, C. Göbel, J.J. Reidy, S. MayTal-Beck, N. R. Stanton, G. Blaylock, and A. K. Tripathi
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Pion, Hadron, Charge (physics), Sensitivity (control systems), Mixing (physics)
Abstract: We present results of a search for ${D}^{0}\ensuremath{-}{D}^{0}$ mixing and doubly-Cabibbo-suppressed decays of the ${D}^{0}$ in Fermilab experiment E791, a fixed-target charm hadroproduction experiment. We look for evidence of mixing in the decay chain ${D}^{*}\ensuremath{\rightarrow}\ensuremath{\pi}\stackrel{\ensuremath{\rightarrow}}{D}\ensuremath{\pi}(K\ensuremath{\pi}$ or $K\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\pi})$. If the charge of the pion from the ${D}^{*}$ decay is the same as the charge of the kaon from the $D$ decay (a ``wrong-sign'' event), mixing may have occurred. Mixing can be distinguished from other sources of wrong-sign events (such as doubly-Cabibbo-suppressed decays) by analyzing the distribution of decay times. We see no evidence of mixing. Allowing for $\mathrm{CP}$ violation in the interference between DCS and mixing amplitudes our fitted ratio for mixed to unmixed decay rates is ${r}_{\mathrm{mix}}{=(0.39}_{\ensuremath{-}0.32}^{+0.36}\ifmmode\pm\else\textpm\fi{}0.16)%$. This corresponds to a 90% C.L. upper limit of ${r}_{\mathrm{mix}}l0.85%$. The sensitivity of this result is comparable to that of previous measurements, but the assumptions made in fitting the data are notably more general. We present results from many fits to our data under various assumptions. If we assume ${r}_{\mathrm{mix}}=0$, we find a two-sigma wrong-sign enhancement in the $K\ensuremath{\pi}$ mode which we ascribe to doubly Cabibbo-suppressed decays. The ratios of doubly Cabibbo-suppressed decays to Cabibbo-favored decays are ${r}_{\mathrm{dcs}}(K\ensuremath{\pi}{)=(0.68}_{\ensuremath{-}0.33}^{+0.34}\ifmmode\pm\else\textpm\fi{}0.07)%$ and ${r}_{\mathrm{dcs}}(K\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\pi}{)=(0.25}_{\ensuremath{-}0.34}^{+0.36}\ifmmode\pm\else\textpm\fi{}0.03)%$.
Published: 1998
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16. Asymmetries between the production of D− and D+ mesons from 500 GeV/c π− nucleon interaction as functions of x and p2

Author: D. C. Langs, A. Nguyen, J. R. T. de Mello Neto, S. Takach, B. T. Meadows, M. D. Sokoloff, P. R. Burchat, K. C. Peng, I. Bediaga, R. Zaliznyak, S. MayTal-Beck, Simon Kwan, G. Blaylock, N. Witchey, K. O'Shaughnessy, A. Fernandez, L. M. Cremaldi, E. Wolin, N. R. Stanton, S. Radeztsky, S. Yoshida, J. Wiener, R. H. Milburn, E.M. Aitala, P. Gagnon, A. Napier, K. Denisenko, Sudeshna Banerjee, S. B. Bracker, C. Göbel, C. Zhang, D. J. Summers, D. Yi, M. V. Purohit, K. Gounder, J. A. Appel, J. M. De Miranda, J.J. Reidy, N. K. Copty, R. Weiss-Babai, A.J. Schwartz, S. Amato, L.P. Perera, A.K.S. Santha, B. Lundberg, N. W. Reay, J. Leslie, C. L. Darling, A.B. d'Oliveira, A.M. Halling, Kevin Stenson, B. Quinn, Daniel Ashery, K. Thorne, S. Watanabe, A. J. Slaughter, H. A. Rubin, D. Mihalcea, C. James, A. C. dos Reis, R. A. Sidwell, Alberto Santoro, A. K. Tripathi, R. A. Burnstein, A. Rafatian, G. Hurvits, M. Sheaff, H.S. Carvalho, G. Herrera, J. C. Anjos, P.A. Kasper, and T. Carter
Subjects: Physics, Nuclear and High Energy Physics, Meson, High Energy Physics::Lattice, media_common.quotation_subject, Nuclear Theory, High Energy Physics::Phenomenology, Asymmetry, Charm quark, Nuclear physics, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, Nucleon, media_common
Abstract: We present measurements of the production of Ds− mesons relative to Ds+ mesons as functions of xF and of pt2 for a sample of 2445 Ds decays to φπ. The Ds mesons were produced in Fermilab experiment E791 with 500 GeV/c π− mesons incident on one platinum and four carbon foil targets. The acceptance-corrected integrated asymmetry in the xF range −0.1 to 0.5 for Ds± mesons is 0.032 ± 0.022 ± 0.022, consistent with no net asymmetry. We compare the results as functions of xF and pt2 to predictions and to the large production asymmetry observed for D± mesons in the same experiment. These comparisons support the hypothesis that production asymmetries come from the fragmentation process and not from the charm quark production itself.
Published: 1997
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17. The doubly Cabibbo-suppressed decay D+ → K+ π− π+

Author: S. Yoshida, N. Witchey, A. Fernandez, L. M. Cremaldi, E. Wolin, B. Quinn, L.P. Perera, P.A. Kasper, D. C. Langs, S. B. Bracker, S. Takach, Alberto Santoro, K. O'Shaughnessy, N. K. Copty, R. A. Sidwell, Kevin Stenson, A. Nguyen, S. May Tal-Beck, R. A. Burnstein, A. Napier, D. J. Summers, K. Gounder, K. Denisenko, J. A. Appel, S. Watanabe, J. M. De Miranda, A. Rafatian, J.J. Reidy, K. C. Peng, D. Yi, A.J. Schwartz, M. V. Purohit, R. H. Milburn, R. Weiss-Babai, B. Lundberg, G. Hurvits, I. Bediaga, A.M. Halling, S. Radeztsky, A. C. dos Reis, A.K.S. Santha, K. Thorne, Daniel Ashery, N. R. Stanton, T. Carter, Simon Kwan, A.B. d'Oliveira, C. L. Darling, E.M. Aitala, Sudeshna Banerjee, H. A. Rubin, G. Herrera, P. Gagnon, A. J. Slaughter, B. T. Meadows, N. W. Reay, J. Leslie, M. D. Sokoloff, P. R. Burchat, S. Amato, J. R. T. de Mello Neto, G. Blaylock, R. Zaliznyak, H.S. Carvalho, J. C. Anjos, J. Wiener, C. James, C. Zhang, A. K. Tripathi, and M. Sheaff
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Branching fraction, Analytical chemistry, Dalitz plot, Fermilab
Abstract: We report the observation of the doubly Cabibbo-suppressed decay D + → K + π − π + in data from Fermilab charm hadroproduction experiment E791. With a signal of 59 ± 13 events we measured the ratio of the branching fraction for this mode to that of the Cabibbo-favored decay D + → K − π + π + to be B (D + → K + π − π + ) / B ( D + → K − π + π + ) = (7.7 ± 1.7 ± 0.8) × 10 −3 . A Dalitz plot analysis was performed to search for resonant structures.
Published: 1997
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18. Observation of D - π production correlations in 500 GeV π− - N interactions

Author: E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, I. Costa, L.M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, P. Gagnon, S. Gerzon, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B.T. Meadows, J.R.T. de Mello Neto, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, N.R. Stanton, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, FOS: Physical sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), symbols.namesake, Pion, Fragmentation (mass spectrometry), Phase space, Pi, symbols, Feynman diagram, High Energy Physics::Experiment, Fermilab, Nuclear Experiment
Abstract: We study the charge correlations between charm mesons produced in 500 GeV pi- - N interactions and the charged pions produced closest to them in phase space. With 110,000 fully reconstructed D mesons from experiment E791 at Fermilab, the correlations are studied as functions of the Dpi - D mass difference and of Feynman x. We observe significant correlations which appear to originate from a combination of sources including fragmentation dynamics, resonant decays, and charge of the beam., Comment: 12 pages and 2 figures
Published: 1997
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19. Measurement of the branching ratio

Author: E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, P. Gagnon, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, N.R. Stanton, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Charm (quantum number)
Abstract: We report a measurement of the branching ratio B(D+-->rho^0 l nu)/ B(D+-->K*0 l nu) from the Fermilab charm hadroproduction experiment E791. Based on signals of 49+-17 events in the D+--> rho^0 e nu mode and 54+-18 events in the D+--> rho^0 mu nu mode, we measure B(D+-->rho^0 e nu)/B(D+-->K*0 e nu) = 0.045+-0.014+-0.009, and B(D+-->rho^0 mu nu)/B(D+-->K*0 mu nu) = 0.051+-0.015+-0.009. Combining the results from both the electronic and muonic modes, we obtain B(D+-->rho^0 l nu)/B(D+-->K*0 l nu) = 0.047+-0.013. This result is compared to theoretical predictions.
Published: 1997
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20. Mass splitting and production of Σc0 and Σc++ measured in 500 GeV π− -N interactions

Author: M. Sheaff, Michael Sokoloff, I. Costa, K. O'Shaughnessy, S. Gerzon, Milind Purohit, I. Bediaga, A. Rafatian, H.S. Carvalho, Don Summers, J. G. Smith, L. M. Cremaldi, E. Wolin, R.A. Burnstein, B. Quinn, A. Nguyen, S. Takach, E.M. Aitala, P.A. Kasper, Sudeshna Banerjee, J.J. Reidy, H. A. Rubin, Aleardo Manacero, G. Hurvits, N. R. Stanton, D. C. Langs, C. L. Darling, S. Amato, K. Gounder, J. M. De Miranda, S. B. Bracker, K. C. Peng, J. R. T. de Mello Neto, J. Wiener, J. Lichtenstadt, C. James, Simon Kwan, B. Lundberg, A.J. Slaughter, R. H. Milburn, S. MayTal-Beck, N. Kondakis, N. Witchey, A. K. Tripathi, A.K.S. Santha, T. Carter, K. Sugano, A. Fernandez, Jürgen Engelfried, Patricia R. Burchat, A.J. Schwartz, P. Gagnon, D. Ashery, G. Blaylock, S. Radeztsky, S. Watanabe, L.P. Perera, J. A. Appel, J. C. Anjos, Alberto Santoro, N. W. Reay, J. Leslie, A.M. Halling, Brian Meadows, R. Zaliznyak, R. A. Sidwell, K. Thorne, G. Herrera, A. Napier, K. Denisenko, D. Yi, R. Weiss-Babai, A. C. dos Reis, A. B. d'Oliveira, C. Zhang, and N. K. Copty
Subjects: Physics, Nuclear and High Energy Physics, Mass spectrum, Analytical chemistry, Spectral line
Abstract: From a sample of 2722 ± 78 Λc+ decaying to the pK−π+ final state, we have observed, in the hadroproduction experiment E791 at Fermilab, 143 ± 20 Σc0 and 122 ± 18 Σc++ through their decays to Λc+π±. The mass difference M(Σc0) − M(Λc+) is measured to be (167.38 ± 0.29 ± 0.15) MeV; for M(Σc++) − M(Λc+), we find (167.76 ± 0.29 ± 0.15) MeV. The rate of Λc+ production from decays of the Σc triplet is (22 ± 2 ± 3) % of the total Λc+ production assuming equal rate of production from all three, as measured for Σc0 and Σc++. We do not observe a statistically significant Σc baryon-antibaryon production asymmetry. The xF and pt2 spectra of Λc+ from Σc decays are observed to be similar to those for all Λc+'s produced.
Published: 1996
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21. Asymmetries between the production of D+ and D− mesons from 500 GeV/c π−-nucleus interactions as a function of xF and pt2

Author: S. Gerzon, A. Álvarez Fernández, N. Witchey, A. Nguyen, T. Carter, J. G. Smith, B. T. Meadows, B. Quinn, L. M. Cremaldi, E. Wolin, M. D. Sokoloff, N. R. Stanton, P. R. Burchat, D. C. Langs, R. A. Burnstein, A. Napier, A. Rafatian, M. V. Purohit, K. Denisenko, D. Yi, C. Zhang, Daniel Ashery, R. Weiss-Babai, A.K.S. Santha, G. Hurvits, J.J. Reidy, B. Lundberg, K. O'Shaughnessy, A.B. d'Oliveira, E.M. Aitala, K. Sugano, P.A. Kasper, S. Amato, K. C. Peng, Alberto Santoro, H. A. Rubin, S. Banerjee, A. J. Slaughter, S. MayTal-Beck, D. Granite, N. Kondakis, I. Bediaga, L. Perera, J. Wiener, P. Gagnon, J. R. T. de Mello Neto, G. Blaylock, C. Göbel, R. A. Sidwell, K. Thorne, S. Watanabe, J. Astorga, C. L. Darling, C. James, D. J. Summers, K. Gounder, J. M. De Miranda, R. H. Milburn, R. Zaliznyak, H.S. Carvalho, A. C. Reis, A.M. Halling, S. Takach, S. Radeztsky, A. J. Schwartz, G. Herrera, Aleardo Manacero, J. A. Appel, Simon Kwan, N. W. Reay, J. Leslie, S. B. Bracker, M. Aryal, J. C. Anjos, A. K. Tripathi, M. Sheaff, I. Costa, and J. Lichtenstadt
Subjects: Physics, Quark, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, Function (mathematics), High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pi, High Energy Physics::Experiment, Production (computer science), Fermilab, Nuclear Experiment, Nucleon, Beam (structure)
Abstract: We present asymmetries between the production of D+ and D- mesons in Fermilab experiment E791 as a function of xF and pt**2. The data used here consist of 74,000 fully-reconstructed charmed mesons produced by a 500 GeV/c pi- beam on C and Pt foils. The measurements are compared to results of models which predict differences between the production of heavy-quark mesons that have a light quark in common with the beam (leading particles) and those that do not (non-leading particles). While the default models do not agree with our data, we can reach agreement with one of them, PYTHIA, by making a limited number of changes to parameters used.
Published: 1996
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22. Obtaining physics results from the SLD CRID

Author: Robert Wilson, J. A. Coller, M Nussbaum, G. Hallewell, T. Bienz, P. Antilogus, W. Dunwoodie, A.K.S. Santha, R. Ben-David, J. S. Whitaker, R. A. Johnson, P.E. Rensing, Kazuo Hasegawa, T. Nagamine, D.C. Schultz, S. Willocq, P. Stamer, A. Bean, B. N. Ratcliff, Yeong-Dae Kwon, G Müller, D. Aston, J. Va'vra, J Snyder, M. Cavalli-Sforza, K. Abe, K.G. Baird, David A. Williams, Yukio Hasegawa, J. D. Turk, D. W. G. S. Leith, F. Suekane, Brian Meadows, E. P. Solodov, S. H. Williams, N. Toge, H. Yuta, D. G. Coyne, L. Mathys, S. Dasu, S. L. Shapiro, Y. Iwasaki, J. Huber, C. Simopoulos, C. Baltay, I. Stockdale, S. Manly, A. Lu, F. Bird, G. B. Word, James Shank, Dominik Müller, S. J. Yellin, S. Sen, M. Kalelkar, S. McHugh, David O. Caldwell, P.F. Jacques, H. Kawahara, T.J. Pavel, J. Duboscq, S. Narita, R.J. Plano, A.B. d'Oliveira, P. Coyle, X. Liu, J. Martinez, and M. Dima
Subjects: Nuclear physics, Momentum, Physics, Nuclear and High Energy Physics, Particle physics, law, Likelihood ratio method, Measuring instrument, Particle accelerator, Instrumentation, Particle detector, Particle identification, law.invention
Abstract: We describe the likelihood ratio method used for particle identification in the SLD CRID, which allows the use of the entire momentum range covered by the liquid and gas radiators, including the threshold regions. Its application to two preliminary physics analyses is also described.
Published: 1996
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23. Operational status and performance of the SLD CRID

Author: S. Willocq, M. Cavalli-Sforza, J Snyder, P. Coyle, F. Suekane, Brian Meadows, Robert Wilson, S. Dasu, C. Baltay, M. Dima, T. Bienz, J. A. Coller, Y. Iwasaki, G. Muller, R.J. Plano, S. L. Shapiro, W. Dunwoodie, A. Bean, J. S. Whitaker, R. A. Johnson, E. P. Solodov, T. Nagamine, J. D. Turk, D.C. Schultz, Yeong-Dae Kwon, Y. Hasegawa, A. Lu, P.F. Jacques, H. Yuta, L. Mathys, M. Kalelkar, G. Hallewell, M. Nussbaum, Kazuo Hasegawa, D. Aston, K.G. Baird, S. J. Yellin, R. Ben-David, S. Sen, J. Huber, David A. Williams, H. Kawahara, D. W. G. S. Leith, C. Simopoulos, P. E. Stamer, I. Stockdale, P.E. Rensing, F. Bird, S. McHugh, D. G. Coyne, D. O. Caldwell, S. H. Williams, N. Toge, T.J. Pavel, P. Antilogus, Dominik Müller, S. Manly, James Shank, A.K.S. Santha, A.B. d'Oliveira, G. B. Word, J. Duboscq, S. Narita, J. Va'vra, B. N. Ratcliff, X. Liu, J. Martinez, and K. Abe
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, law, Particle accelerator, Instrumentation, Transparency (behavior), Engineering physics, law.invention
Abstract: The operation and performance of the SLD CRID achieved during the recently completed 1994–1995 run of the SLC will be discussed. Stable operation of liquid (C6F14) and gas (85% C5F12 and 15% N2) radiators with good UV transparency has been achieved. Our expectations for the future SLD physics program will also be briefly discussed.
Published: 1996
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24. Results from the SLD barrel CRID detector

Author: T. Nagamine, D.C. Schultz, F. Bird, T.J. Pavel, X. Liu, J. Martinez, R.J. Plano, S. McHugh, G. B. Word, James Shank, S. Willocq, Y. Hasegawa, P. Coyle, M. Kalelkar, M. Nussbaum, Koji Abe, C. Simopoulous, E. P. Solodov, Y. Kwon, H. Yuta, L. Mathys, Kazuo Hasegawa, D. W. G. S. Leith, S. H. Williams, N. Toge, A. Lu, J. Duboscq, J. A. Snyder, F. Suekane, Brian Meadows, A. Bean, A.B. d'Oliveira, I. Stockdale, Dominik Müller, R. Ben-David, David O. Caldwell, D. G. Coyne, S. L. Shapiro, T. Bienz, P.F. Jacques, S. Yellin, G. Muller, H. Kawahara, W. Dunwoodie, S. Dolinsky, M. Cavalli-Sforza, J. S. Whitaker, R. A. Johnson, B. N. Ratcliff, S. Dasu, Y. Iwasaki, J. Huber, J. Va'vra, M.D. Sokoloff, Robert Wilson, J. A. Coller, G. Hallewell, P. Antilogus, A.K.S. Santha, D. Aston, P.E. Rensing, P. Stamer, K.G. Baird, J. D. Turk, David A. Williams, and S. Manly
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Detector, Particle accelerator, Particle detector, Linear particle accelerator, law.invention, Nuclear physics, Nuclear Energy and Engineering, law, Measuring instrument, Radiator (engine cooling), Angular resolution, Electrical and Electronic Engineering, Cherenkov radiation
Abstract: We report on operational experience with and experimental performance of the SLD barrel Cherenkov Ring Imaging Detector from the 1992 and 1993 physics runs. The liquid (C/sub 6/F/sub 14/) and gas (C/sub 5/F/sub 12/) radiator recirculation systems have performed well, and the drift gas supply system has operated successfully with TMAE for three years. Cherenkov rings have been observed from both the liquid and gas radiators. The number and angular resolution of Cherenkov photons have been measured, and found to be close to design specifications. >
Published: 1994
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25. Performance of the CRID at SLD

Author: Robert Wilson, Suliana Manley, G. Hallewell, D. W. G. S. Leith, S. McHugh, F. Suekane, A. Lu, James Shank, R.J. Plano, T. Bienz, J. Coller, P.E. Rensing, W. Dunwoodie, S. Dolinsky, P. Coyle, P. Antilogus, K. Hasegawa, J. S. Whitaker, R. A. Johnson, B. N. Ratcliff, G. Muller, A.K.S. Santha, Y. Hasegawa, D. Aston, S. Dasu, Y. Iwasaki, M. Kalelkar, Koya Abe, D. G. Coyne, X. Liu, F. Bird, B. Meadows, S. H. Williams, J. Va'vra, P. Stamer, Yeong-Dae Kwon, N. Toge, E. P. Solodov, J. D. Turk, H. Yuta, L. Mathys, K.G. Baird, David A. Williams, C. Simopoulos, S. J. Yellin, R. Ben-David, I. Stockdale, D.C. Schultz, G. B. Word, D.O. Caldwell, J. Huber, Dominik Müller, A. Bean, J. Duboscq, S. L. Shapiro, P.F. Jacques, Tadashi Nagamine, T.J. Pavel, M. Cavalli-Sforza, H. Kawahara, M.D. Sokoloff, A.B. d'Oliveira, J. A. Snyder, J. Martinez, and M. Nussbaum
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Ring (mathematics), law, Detector, Particle accelerator, Instrumentation, Cherenkov radiation, law.invention
Abstract: This paper describes the performance of a large 4π Cherenkov Ring Imaging Detector (CRID) in the SLD experiment at the SLC at SLAC. We compare the most recent SLD results with those obtained during the R&D period, discuss various design features, and highlight some specific lessons derived from three years of operation.
Published: 1994
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26. Performance of the SLD barrels CRID during the 1992 physics data run

Author: F. Bird, P.E. Rensing, T.J. Pavel, A. Lu, F. Suekane, J. Huber, P.F. Jacques, Dominik Müller, N. Toge, T. Nagamine, D.C. Schultz, J. D. Turk, Kazuo Hasegawa, S. Dasu, Y. Iwasaki, D. Aston, X. Liu, G. Muller, J. Martinez, M. Cavalli-Sforza, B. T. Meadows, M. D. Sokoloff, H. Kawahara, R.J. Plano, Yukio Hasegawa, J. Va’vra, G. B. Word, S. Manly, D. G. Coyne, M. Nussbaum, S. H. Williams, P. Coyle, D. O. Caldwell, E. P. Solodov, H. Yuta, L. Mathys, R. Ben-David, A.B. d'Oliveira, J. A. Snyder, A. Bean, S. J. Yellin, I. Stockdale, S. L. Shapiro, Y. Kwon, K.G. Baird, David A. Williams, M. Kalelkar, J. Duboscq, B. N. Ratcliff, C. Simopoulos, P. E. Stamer, T. Bienz, W. Dunwoodie, S. Dolinsky, J. S. Whitaker, R. A. Johnson, R. J. Wilson, Koji Abe, S. McHugh, James Shank, J. A. Coller, G. Hallewell, D. W. G. S. Leith, P. Antilogus, and A.K.S. Santha
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Detector, Cosmic ray, Particle accelerator, Electron, law.invention, Nuclear physics, Nuclear Energy and Engineering, law, Measuring instrument, Electrical and Electronic Engineering, Collider, Cherenkov radiation, Lepton
Abstract: Summary form only. The performance of the Cherenkov Ring Imaging Detector (CRID) of the SLD experiment at the SLAC linear collider during the 1992 physics data run is discussed. The barrel CRID is complete and fully operational. Cherenkov rings have been observed from both the liquid and the gas radiators. The rings are associated with particle tracks measured in the central drift chamber and the radius of the ring together with the momentum measurement is used to identify particles. Work is in progress to improve the resolution by better determining the position of the drift boxes, the mirrors, and the central drift chamber relative to one other using data from cosmic rays and Z/sup 0/ chambers. >
Published: 1993
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27. First measurement of the left-right cross section asymmetry inZboson production bye+e−collisions

Author: J. Duboscq, Tadayuki Takahashi, S. Bethke, W. T. Emmet, R. Dolin, R. King, J. Hodgson, Sridhara Dasu, G.J. Tappern, S. A. Wickert, P. C. Rowson, R. J. Stephenson, R. Prepost, D. Pripstein, M. Tecchio, J. E. Brau, A. W. Weidemann, A. Yim, P.F. Jacques, T. Dean, T. H. Burnett, Amitabh Lath, H. Yuta, L. Piemontese, B. F. Wadsworth, Enrico Pieroni, E. Hyatt, L. Mathys, R. H. Schindler, A. Szumilo, G. Tarnopolsky, M. Settles, Roberto Battiston, R. Davis, A. Nuttall, T. A. Hodges, R. R. Kofler, D. Walz, A. V. Kulikov, R. Messner, J. F. Labs, J.P. Venuti, P. E.L. Clarke, A. Rothenberg, D. Mansour, R. Kroeger, D. Axen, A. Gioumousis, W. A. Majid, H. J. Hargis, C.J.S. Damerell, R. J. Wilson, D. J. Sherden, A. K. Honma, E. Vella, A. I. Mincer, S. H. Williams, A. O. Bazarko, D. D. Durrett, O. Chamberlain, J. A. Coller, E. L. Garwin, John Fox, N. Toge, D. Horelick, C. Baltay, M. D. Hildreth, F. Bird, C. Y. Prescott, D. W. G. S. Leith, P. Coyle, H. Cutler, C. J. Oram, H. Masuda, H. L. Lynch, R. Bell, J. Olsen, Nicholas Walker, J. Escalera, A.P.T. Palounek, Roberto Dell'Orso, L. P. Robertson, Melody A. Swartz, D. Su, D. Warner, R. R. Larsen, H. Petersen, J. Clendenin, A. Astbury, R. J. Morrison, G. A. Beer, D. R. Freytag, R. H. Siemann, Philip Burrows, T. Hansl-Kozanecka, S. McHugh, A. L. Shoup, R. E. Cassell, P.E. Rensing, T. Shimomura, M. Piccolo, M. J. Fox, J. Rothberg, D.C. Schultz, R. Langstaff, I. Abt, L. Pescara, I. Stockdale, G. Stewart, H. Shaw, P. De Simone, J. M. Yamartino, D. J. Mellor, M. Langston, O. Bardon, R.L. English, R. Watt, V. Cook, R. Cotton, M. Petradza, P. M. Mockett, V. Ashford, P. Saez, Michael S. Witherell, R. de Sangro, K. Skarpaas, R. C. Hilomen, T. Fieguth, Wit Busza, J. Flynn, D. Aston, G. Mancinelli, Patrick Krejcik, R. Rinta, T. W. Reeves, Rino Castaldi, H. O. Cohn, M. Loreti, V. Ziemann, K. Hasegawa, Richard Keeler, S. Kaiser, S. Hedges, J. L. Turner, G. Agnew, Joseph Izen, B. Burgess, L. Servoli, R. J. Belcinski, K. K. Young, John Scott Whitaker, X. Liu, Koji Abe, P. Kunz, S. S. Hertzbach, W. Craddock, G. Hallewell, I. Karliner, M. G. Strauss, Dominik Müller, J. Carr, D. Calloway, A. Lu, C. C. Young, B. I. Eisenstein, Elliot Hughes, T. Junk, M. Carpinelli, S. Bougerolle, G. D. Punkar, J. D. Turk, D. L. Burke, H. O. Ogren, R. W. Williams, W. M. Bugg, U. Schneekloth, S.C. Berridge, A. Disco, D. L. Hale, G. M. Bilei, G. R. Bower, James Shank, R. Cowan, Andrea Castro, Henry W. Kendall, L. Chen, R. K. Jobe, R. Ossa, Gunther Haller, O. H. Saxton, E. Rutz, C. Alber, T. Schalk, F. Toevs, J. J. Thaler, R. Claus, J. Fujimoto, D. P. Gurd, R. K. Yamamoto, P. Stiles, M. Minty, B. N. Ratcliff, S. Ecklund, D. Chambers, J. Wyss, C. Simopoulos, H. R. Band, J. A. Lauber, A. Santocchia, C. Yee, E. Erdos, P. Poffenberger, Yeong-Dae Kwon, G. Blaylock, D. A. Forbush, J. Huber, D. Kharakh, B. Camanzi, W. W. Ash, W. J. Wisniewski, F. Suekane, R.J. Plano, P. E. Stamer, M. Schneider, G. Eigen, M. Turcotte, M. D. Woodly, P. Zucchelli, G. Putallaz, M. J. Haney, A. Bean, C. G. Arroyo, B.L. Byers, W. Baker, W. L. Spence, S.R. Smith, Fred Wickens, A. P. Waite, J. T. Seeman, C. Zeitlin, T. Lyons, T. Bienz, N. Phinney, Martin Breidenbach, S. J. Yellin, L. Lintern, L. Paffrath, A. Calcaterra, K.G. Baird, R. Berger, C. Jako, N.M. Krishna, R.D. Elia, G. E. Gladding, S. Manly, I. M. Peruzzi, E. Mazzucato, R. Pitthan, Hyun-Chul Kim, J. J. Russell, Y. C. Du, W. Dunwoodie, David A. Williams, Y. Au, A. K. McKemey, R. F. Boyce, M. Zolotorev, J. A. Snyder, K. T. Pitts, L.S. Osborne, G. H. Zapalac, H. Tang, A. S. Johnson, M. Kalelkar, J. Frisch, R. S. Panvini, J. Hoeflich, T. Maruyama, B. A. Schumm, K.C. Moffeit, G. B. Word, G. E. Schultz, R. A. Johnson, R. Steiner, P. Antilogus, M. H. Kelsey, J. C. Sheppard, S. Gonzalez, M. Gaillard, A. Snyder, Thomas W. Markiewicz, S. L. Cartwright, K. Furuno, A. D. Yeremian, T. Gillman, V. Nesterov, H.J. Kang, Maurizio Biasini, T. Himel, Marc Ross, Yukio Hasegawa, H. A. Neal, Shiro Suzuki, D. F. Alzofon, Michele Gallinaro, D. Cords, M. Kowitt, A.K.S. Santha, R. W. Zdarko, D. G. Coyne, D. C. Williams, T. Bolton, C. Vannini, G. Oxoby, R. Shypit, Gilbert Shapiro, R. Verdier, E. L. Hart, D. Peters, A. Seiden, R. W. Downing, M. Z. Tahar, P. J. Emma, Alberto Benvenuti, H. Kawahara, C. Fan, T.J. Pavel, R. Frey, S. De Simone, F. Perrier, J. R. Johnson, R. Kajikawa, G. Mundy, V. Hamilton, P. D. Acton, P. C. Kim, H. M. Steiner, L. Rosenson, P. Schenk, K. M. Fortune, Richard Dubois, R. Ben-David, J. Zhou, M. Woods, J. Va’vra, M. Nordby, T. E. Browder, B. Mours, T. Nagamine, Nicola Bacchetta, D. McCormick, D. O. Caldwell, J. F. McGowan, G. Mazaheri, A. Sugiyama, M. Nussbaum, G. Mueller, Stephen Watts, F. Barrera, S. Jones, F. E. Taylor, M.E. Huffer, J. R. Bogart, J. Ferrie, R. Sobie, A. Mazzucato, Piero Giorgio Verdini, M. Pauluzzi, J. Ma, L. Camilleri, J. D. Richman, G. B. Chadwick, T. Weber, Giancarlo Mantovani, H. Hwang, Michael J. Fero, S.St. Lorant, J.I. Friedman, L.S. Rochester, Y. Iwasaki, T. L. Usher, M. Cavalli-Sforza, B. T. Meadows, D. G. Hitlin, F. J. Decker, M. D. Sokoloff, E.N. Spencer, H. Park, M. H. Shaevitz, G. Baranko, T. Limberg, D. R. Rust, G. R. Mason, S. L. White, D. Nelson, P. Raimondi, S. L. Shapiro, P. Rankin, A.B. d'Oliveira, U. Nauenberg, J. Harrison, Chris Adolphsen, R. Blumberg, F. Dejongh, Dario Bisello, and M. Klein
Subjects: Physics, Particle physics, Cabibbo–Kobayashi–Maskawa matrix, media_common.quotation_subject, General Physics and Astronomy, Elementary particle, Production (computer science), Beam polarization, Asymmetry, Energy (signal processing), media_common, Standard Model, Boson
Abstract: We present the first measurement of the left-right cross section asymmetry (${\mathit{A}}_{\mathit{L}\mathit{R}}$) for Z boson production by ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ collisions. The measurement was performed at a center-of-mass energy of 91.55 GeV with the SLD detector at the SLAC Linear Collider which utilized a longitudinally polarized electron beam. The average beam polarization was (22.4\ifmmode\pm\else\textpm\fi{}0.6)%. Using a sample of 10 224 Z decays, we measure ${\mathit{A}}_{\mathit{L}\mathit{R}}$ to be 0.100\ifmmode\pm\else\textpm\fi{}0.044(stat)\ifmmode\pm\else\textpm\fi{}0.004(syst), which determines the effective weak mixing angle to be ${\mathrm{sin}}^{2}$${\mathrm{\ensuremath{\theta}}}_{\mathit{W}}^{\mathit{e}\mathit{f}\mathit{f}}$=0.2378 \ifmmode\pm\else\textpm\fi{}0.0056(stat)\ifmmode\pm\else\textpm\fi{}0.0005(syst).
Published: 1993
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28. Initial performance of the SLD Cherenkov ring imaging detector system

Author: J. Huber, S. Yellin, Robert Wilson, A. Lu, J. Duboscq, X. Liu, David O. Caldwell, Kazuo Hasegawa, G. Hallewell, P. Gagnon, M. Nussbaum, M. Kalelkar, S. McHugh, P.E. Rensing, Sridhara Dasu, Koji Abe, C. Simopoulos, P. E. Stamer, J. Martinez, T. Nagamine, D.C. Schultz, K.G. Baird, David A. Williams, P. Coyle, P. Antilogus, D. Aston, D. Coyne, F. Suekane, B. N. Ratcliff, A.K.S. Santha, R.A. Johnson, R.J. Plano, A. L. Shoup, T. Bienz, John Scott Whitaker, D. W. G. S. Leith, W. Dunwoodie, S. Dolinsky, S. H. Williams, N. Toge, M. Cavalli-Sforza, T.J. Pavel, A. D'Oliveira, S. L. Shapiro, P. Jacques, F. Bird, H. Kawahara, J. Va’vra, Michael S. Witherell, Y. Kwon, A. Bean, B. T. Meadows, M. D. Sokoloff, Dominik Müller, E. P. Solodov, H. Yuta, L. Mathys, I. Stockdale, and G. B. Word
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Detector, Cosmic ray, Particle accelerator, Particle detector, Linear particle accelerator, law.invention, Nuclear physics, Nuclear Energy and Engineering, law, Measuring instrument, Calibration, High Energy Physics::Experiment, Electrical and Electronic Engineering, Cherenkov radiation
Abstract: All of the major subsystems for the barrel Cerenkov Ring Imaging Detector (CRID) in the SLAC Large Detector (SLD) at Stanford Linear Accelerator Center (SLAC) have now been commissioned. The CRID participated in the SLD engineering run of June-August 1991. In a cosmic ray test at the end of the run, Cerenkov rings were observed for the first time. Initial data for the CRID, including Cerenkov rings, studies of minimum ionizing particles, and data from the fiber optics calibration system are presented. The SLD engineering run and the ensuing dedicated CRID test runs have demonstrated that the system behaves as expected. It has been possible to track particles using ionization in the drift boxes and to reconstruct single electron coordinates very well. The runs have also enabled debugging of this complex system. >
Published: 1992
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29. Performance of the front end electronics and data acquisition system for the SLD Cherenkov ring imaging detector

Author: Robert Wilson, A. Lu, John Scott Whitaker, J. Martinez, P. Coyle, T.J. Pavel, G. Hallewell, B. Meadows, A. Bean, J. Va'vra, S. H. Williams, N. Toge, P.E. Rensing, P. Antilogus, Koya Abe, T. Bienz, J. Duboscq, David O. Caldwell, W. Dunwoodie, S. Dolinsky, A.K.S. Santha, E. P. Solodov, P. Jacques, D. Marshall, D. Coyne, H. Yuta, L. Mathys, B. Ratcliffe, Michael S. Witherell, S. J. Yellin, R.J. Plano, I. Stockdale, H. Kawahara, M. Cavalli-Sforza, J. Huber, F. Suekane, K.G. Baird, David A. Williams, J. Hoeflich, M.D. Sokoloff, M. Kalelkar, C. Simopoulos, G. Oxoby, Y. Kwon, P. E. Stamer, K. Hasegawa, Sridhara Dasu, A. L. Shoup, Dominik Müller, X. Liu, P. Gagnon, D. W. G. S. Leith, G. B. Word, R.A. Johnson, A. D'Oliveira, P. Stiles, S. McHugh, F. Bird, T. Nagamine, D.C. Schultz, D. Aston, S. L. Shapiro, and M. Nussbaum
Subjects: Physics, Nuclear and High Energy Physics, Wire chamber, Physics::Instrumentation and Detectors, business.industry, Detector, Electrical engineering, Particle accelerator, Noise (electronics), Particle detector, law.invention, Optics, Data acquisition, Nuclear Energy and Engineering, law, Nuclear electronics, Electrical and Electronic Engineering, business, Cherenkov radiation
Abstract: The front-end electronics and data acquisition system for the SLD barrel Cherenkov ring imaging detector (CRID) are described. The specifications for this system require a 1% charge division measurement on single e/sup -/ pulses from a wire chamber in the presence of much larger signals. Fast recovery from saturating pulses and noise levels below 2000 electrons root-mean-square for single electron pulses are required. Noise and system performance results are presented for the initial SLD engineering run data. >
Published: 1992
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30. Cherenkov Ring Imaging Detector front-end electronics

Author: Kota Abe, Michael S. Witherell, Robert Wilson, R. J. Morrison, S. McHugh, P.E. Rensing, Y. Kwon, David O. Caldwell, G. Hallewell, P. Stiles, A. Lu, A. d'Oliveria, T. Bienz, J. Huber, W. Dunwoodie, J. S. Whitaker, R. A. Johnson, S. Yellin, K. Hasegawa, G. Oxoby, P. Antilogus, S. H. Williams, E.N. Spencer, C. Simopoulos, N. Toge, A.K.S. Santha, J. Martinez, Dominik Müller, J. Va'vra, M. Nussbaum, S. L. Shapiro, P. Coyle, D. W. G. S. Leith, J. Duboscq, P. Jacques, H. Kawahara, A. L. Shoup, D. Marshall, P. Stamer, A. Bean, R. Plano, D. G. Coyne, B. N. Ratcliff, T. Nagamine, D.C. Schultz, D. Aston, F. Bird, F. Suekane, S. Dasu, E. P. Solodov, H. Yuta, L. Mathys, and I. Stockdale
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, business.industry, Detector, Particle detector, Linear particle accelerator, law.invention, Nuclear Energy and Engineering, law, Nuclear electronics, Miniaturization, Physics::Accelerator Physics, Optoelectronics, High Energy Physics::Experiment, Electrical and Electronic Engineering, business, Collider, Cherenkov radiation
Abstract: The front-end electronics of the Cerenkov Ring Imaging Detector (CRID) used in the Stanford Large Detector (SLD) spectrometer at the Stanford Linear Accelerator Center (SLAC) Linear Collider is described. The Plessey process provides a straightforward and low-cost path toward system miniaturization. System tests show good noise performance, calibration precision, system linearity, and signal shape uniformity over the full dynamic range. >
Published: 1991
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31. Production of 400 mirrors with high VUV reflectivity for use in the SLD Cherenkov ring imaging detector

Author: T. Bienz, W. Dunwoodie, Robert Wilson, J. S. Whitaker, R. A. Johnson, M. Nussbaum, A. Bean, P.E. Rensing, A. L. Shoup, Michael S. Witherell, J. Va'vra, J. Martinez, P. Datte, P. Coyle, G. Hallewell, J. Huber, S. Yellin, Koji Abe, P. Jacques, S. L. Shapiro, H. Kawahara, A. Lu, F. Suekane, J. Duboscq, P. Stamer, P. Antilogus, P. Gagnon, R. Plano, A.K.S. Santha, Dominik Müller, David A. Williams, C. Simopoulos, D. W. G. S. Leith, R. J. Morrison, T.J. Pavel, Kazuo Hasegawa, S. McHugh, David O. Caldwell, Y. Kwon, M. Hilton, S. H. Williams, N. Toge, D. L. Hale, D. G. Coyne, B. N. Ratcliff, E. P. Solodov, H. Yuta, L. Mathys, I. Stockdale, T. Nagamine, D.C. Schultz, D. Aston, and F. Bird
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, business.industry, Scattering, Cherenkov detector, Detector, Ray, law.invention, Optics, law, Distortion, Surface roughness, Physics::Accelerator Physics, Optoelectronics, business, Collider, Instrumentation, Cherenkov radiation
Abstract: The Stanford Large Detector for experimental particle physics detection at the SLAC Linear Collider contains a Cherenkov ring imaging detector (CRID). The barrel CRID mirrors have been successfully produced and installed. The industrial mirror production process, the quality control of the mirrors produced, and the results of the vacuum ultraviolet (VUV) reflectivity and mirror-shape accuracy are described. An average reflectivity of at least 80% for light at 160 nm and 85% for light in the 180–230 nm wavelength range has been achieved in the production of over 400 mirrors of a typical size of 30 by 30 cm. The surface roughness and optical distortion measurements imply that the light loss due to scattering is a few percent of the incident light and the angular error due to shape distortion is less than 1 mrad.
Published: 1991
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32. Construction and testing of the SLD Cerenkov Ring Imaging Detector

Author: M. Nussbaum, D. Aston, P. Antilogus, P. Gagnon, A.K.S. Santha, Robert Wilson, A. Bean, P. Zucchelli, S. McHugh, J. Va'vra, David O. Caldwell, S. Yellin, S. H. Williams, N. Toge, E. P. Solodov, H. Yuta, C. Simopoulos, L. Mathys, F. Suekane, Brian Meadows, K. Hasegawa, T. Bienz, J. Martinez, P. Coyle, W. Dunwoodie, J. Duboscq, S. L. Shapiro, G. Hallewell, I. Stockdale, J. S. Whitaker, R. A. Johnson, Michael S. Witherell, S. Dasu, R. Plano, Kota Abe, M. Cavalli-Sforza, H. Kawahara, F. Bird, D.C. Schultz, D. G. Coyne, D. W. G. S. Leith, T. Nagamine, T.J. Pavel, P.E. Rensing, J. Huber, Dominik Müller, R. J. Morrison, P. Stamer, Y. Kwon, David A. Williams, P. Jacques, A. L. Shoup, A. Lu, and B. N. Ratcliff
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Detector, Particle accelerator, Particle detector, Linear particle accelerator, law.invention, Nuclear physics, Nuclear Energy and Engineering, law, Measuring instrument, Radiator (engine cooling), Physics::Accelerator Physics, High Energy Physics::Experiment, Electrical and Electronic Engineering, Collider, Cherenkov radiation
Abstract: The construction of the Cherenkov Ring Imaging Detector (CRID) for the SLD (Stanford Linear Collider Large Detector) experiment at the SLAC (Stanford Linear Accelerator Center) Linear Collider and the testing of its components is reported. Results are included from testing the drift boxes, liquid radiator trays, and mirrors for the barrel CRID. The development of the support systems essential for the operation of the CRID, namely, gas and liquid recirculation systems and monitoring, are discussed. >
Published: 1990
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33. Publisher’s Note: Model-independent measurement ofS-waveK−π+systems usingD+→Kππdecays from Fermilab E791 [Phys. Rev. D 73, 032004 (2006)]

Author: P. Gagnon, R. Zaliznyak, A.M. Halling, G. Blaylock, M. V. Purohit, S. Banerjee, N. W. Reay, C. L. Darling, J. Leslie, B. T. Meadows, A.B. d'Oliveira, E.M. Aitala, D. C. Langs, M. D. Sokoloff, A.K.S. Santha, P. R. Burchat, N. R. Stanton, B. Lundberg, G. F. Fox, D. J. Summers, Simon Kwan, D. Mihalcea, K. Gounder, K. C. Peng, J. M. De Miranda, S. Devmal, K. O'Shaughnessy, S. Watanabe, M. Sheaff, P.A. Kasper, A. C. dos Reis, N. Witchey, S. M. Yang, A. Napier, K. Denisenko, C. Zhang, S. Yoshida, J. Wiener, C. Göbel, A. Álvarez Fernández, D. Yi, S. B. Bracker, Alberto Santoro, W. M. Dunwoodie, R. H. Milburn, A. J. Slaughter, D. A. Sanders, R. Weiss-Babai, S. Amato, L. M. Cremaldi, R. A. Burnstein, I. Bediaga, E. Wolin, L. Perera, J.J. Reidy, B. Quinn, J. A. Appel, A. Rafatian, K. Thorne, A. Nguyen, S. Takach, A. Massafferri, G. Hurvits, R. A. Sidwell, S. Radeztsky, S. MayTal-Beck, T. Carter, A. K. Tripathi, C. James, J. Magnin, Kevin Stenson, J. C. Anjos, J. R. T. de Mello Neto, A. J. Schwartz, G. Herrera, H.S. Carvalho, N. K. Copty, J. Solano, Daniel Ashery, H. A. Rubin, and R. J. Stefanski
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Particle decay, S-wave, Pi, Fermilab
Published: 2006
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34. Component And System Tests Of The SLD Cerenkov Ring Imaging Detector

Author: J. Martinez, W. Dunwoodie, S. Dolinsky, A. Bean, R. A. Johnson, Sridhara Dasu, John Scott Whitaker, M. Kalelkar, T. Bienz, R. J. Wilson, M. Cavalli-Sforza, B. T. Meadows, D. G. Coyne, X. Liu, T. Pavel, B. N. Ratcliff, P. Antilogus, P. Gagnon, C. Simopoulos, J. Duboscq, P. E. Stamer, P. Coyle, D. W. G. S. Leith, A.K.S. Santha, S. J. Yellin, M. Nussbaum, P.F. Jacques, A. Lu, D. O. Caldwell, F. Bird, R.J. Plano, T. Nagamine, D.C. Schultz, S. McHugh, Kazuo Hasegawa, D. Aston, S. H. Williams, S. L. Shapiro, N. Toge, A. L. Shoup, A. D'Oliveira, E. P. Solodov, H. Yuta, J. Huber, F. Suekane, L. Mathys, H. Kawahara, P.E. Rensing, Michael S. Witherell, I. Stockdale, G. Hallewell, Koji Abe, Dominik Müller, Jaroslav Va'vra, Yeong-Dae Kwon, and David A. Williams
Subjects: Physics, Wire chamber, Optical fiber, Physics::Instrumentation and Detectors, business.industry, Detector, Electron, Particle detector, Linear particle accelerator, law.invention, Optics, law, Calibration, Measuring instrument, Optoelectronics, business
Abstract: The components of the SLD barrel Cerenkov Ring Imaging Detector (CRID) are now built and are being installed. We report on tests of these, including tests of the fiber optic calibration system, detailed studies of electron drift paths on production drift boxes and detectors, tests of the dynamic gating system and its effect on drift path distortions due to space-charge, and a measurement of the electron lifetime in a production drift box. In addition, we report on the UV transmission of recirculated liquid C{sub 6}F{sub 14} and on the effects of CRID construction materials on electron lifetime. 9 refs., 11 figs.
Published: 2005
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35. Cherenkov Ring Imaging Detector Front-end Electronics

Author: P. Antilogus, D. Aston, T. Bienz, F. Bird, S. Dasu, W. Dunwoodie, G. Hallewell, H. Kawahara, Y. Kwon, D. Leith, D. Marshall, D. Muller, T. Nagamine, G. Oxoby, B. Ratcliff, P. Rensing, D. Schultz, S. Shapiro, C. Simopoulos, E. Solodovo, F. Suekane, N. Toge, J. Va'vra, S. Williams, R.J. Wilson, J.S. Whitaker, A. Bean, D. Caldwell, J. Duboseq, J. Huber, A. Lu, L. Mathys, S. McHugh, R. Morrison, M. Witherell, S. Yellin, P. Coyle, D. Coyne, E. Spencer, A. d' Oliveira, R.A. Johnson, J. Martinez, M. Nussbaum, A.K.S. Santha, A. Shoup, I. Stockdale, P. Jacques, R. Plano, P. Stamer, K. Abe, K. Hasegawa, and H. Yuta
Published: 2005
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36. The fluid systems for the SLD Cerenkov Ring Imaging Detector

Author: P. Antilogus, D. Aston, T. Bienz, F. Bird, S. Dasu, S. Dolinsky, W. Dunwoodie, G. Hallewell, H. Kawahara, Y. Kwon, D.W.G.S. Leith, G. Muller, D. Muller, T. Nagamine, T.J. Pavel, B. Ratcliff, P. Rensing, D. Schultz, S. Shapiro, C. Simopoulos, E. Solodov, N. Toge, J. Va'vra, S.H. Williams, M. Cavalli-Sforza, P. Coyle, D. Coyne, X. Liu, D.A. Williams, J. Coller, J.T. Shank, R.J. Wilson, J.S. Whitaker, A. Bean, D.O. Caldwell, J. Duboscq, J. Huber, A. Lu, L. Mathys, S. McHugh, M. Witherell, S. Yellin, R.A. Johnson, J. Martinez, B. Meadows, M. Nussbaum, A. d'Oliveira, A.K.S. Santha, A. Shoup, M.D. Sokoloff, I. Stockdale, K. Baird, P. Jacques, M. Kalelkar, R. Plano, P. Stamer, G. Word, K. Abe, K. Hasegawa, F. Suekane, and H. Yuta
Published: 2003
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37. Performance of the SLD barrel CRID during the 1992 physics data run

Author: P. Antilogus, D. Aston, T. Bienz, F. Bird, S. Dasu, S. Dolinsky, W. Dunwoodie, G. Hallewell, H. Kawahara, Y. Kwon, D.W.G.S. Leith, G. Muller, D. Muller, T. Nagamine, T.J. Pavel, B. Ratcliff, P. Rensing, D. Schultz, S. Shapiro, C. Simopoulos, E. Solodov, N. Toge, J. Va'vra, S.H. Williams, P. Coyle, D. Coyne, X. Liu, D.A. Williams, J. Coller, J.T. Shank, R.J. Wilson, J.S. Whitaker, A. Bean, D.O. Caldwell, J. Duboscq, J. Huber, A. Lu, L. Mathys, S. McHugh, M. Witherell, S. Yellin, R.A. Johnson, J. Martinez, B. Meadows, M. Nussbaum, A. d'Oliveira, A.K.S. Santha, A. Shoup, M.D. Sokoloff, I. Stockdale, K. Baird, P. Jacques, M. Kalelkar, R. Plano, P. Stamer, G. Word, K. Abe, K. Hasegawa, F. Suekane, and H. Yuta
Published: 2003
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38. Performance of the endcap Cherenkov ring imaging detector at SLD

Author: J. Martinez, T. Weber, G. B. Word, F. Suekane, M. Nussbaum, R.J. Plano, G. Muller, P. Coyle, Kazuo Hasegawa, Y. Iwasaki, C. Simopolous, M. Cavalli-Sforza, B. T. Meadows, M. D. Sokoloff, P.E. Rensing, R. Ben-David, Yeong-Dae Kwon, E. P. Solodov, H. Yuta, L. Mathys, J. A. Snyder, J. D. Turk, K.G. Baird, A. D'Oliveira, F. Bird, I. Stockdale, David A. Williams, B. N. Ratcliff, Dominik Müller, S. L. Shapiro, A. Bean, T. Bienz, S. Manly, J. Huber, D.C. Schultz, W. Dunwoodie, Yukio Hasegawa, P. E. Stamer, D. Aston, S. Dolinsky, R. A. Johnson, M. Kalelkar, R. J. Wilson, D. G. Coyne, J. Va’vra, Sercan Sen, S. J. Yellin, John Scott Whitaker, S. H. Williams, N. Toge, T. Nagamine, D. O. Caldwell, D. W. G. S. Leith, Koji Abe, James Shank, X. Liu, S. McHugh, G. Hallewell, P. Antilogus, A.K.S. Santha, Sridhara Dasu, John A. Coller, P.F. Jacques, M.O. Dima, J. Duboscq, A. Lu, H. Kawahara, T.J. Pavel, and S. Willocq
Subjects: Physics, Physics::Instrumentation and Detectors, business.industry, Cherenkov detector, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Ring (chemistry), law.invention, Optics, law, High Energy Physics::Experiment, Nuclear medicine, business, Cherenkov radiation
Abstract: We present the Cherenkov Ring Imaging Detector in the endcap regions of the SLD detector and report on initial performance during the 1993 and 1994 runs at the SLC. The endcap CRID was completed and commissioned in 1993 and is fully operational for the 1994 run. First Cherenkov rings have been observed. The endcap CRID detectors and fluid systems are described and initial operational experience is discussed. >
Published: 2002
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39. Performance of the front end electronics and data acquisition system for the SLD Cherenkov Ring Imaging Detector

Author: K. Abe, P. Antilogus, D. Aston, K. Baird, A. Bean, T. Bienz, F. Bird, D. Caldwell, M. Cavalli-Sforza, P. Coyle, D. Coyne, S. Dasu, S. Dolinsky, A. d'Oliveira, J. Duboscq, W. Dunwoodie, P. Gagnon, G. Hallewell, K. Hasegawa, J. Hoeflich, J. Huber, P. Jacques, R.A. Johnson, M. Kalelkar, H. Kawahara, Y. Kwon, D.W.G.S. Leith, X. Liu, A. Lu, D. Marshall, J. Martinez, L. Mathys, S. McHugh, B. Meadows, D. Muller, T. Nagamine, M. Nussbaum, G. Oxoby, T.J. Pavel, R. Plano, B. Ratcliffe, P. Rensing, A.K.S. Santha, D. Schultz, S. Shapiro, A. Shoup, C. Simopoulos, M.D. Sokoloff, E. Solodov, P. Stamer, P. Stiles, I. Stockdale, F. Suekane, N. Toge, J. Va'vra, J.S. Whitaker, D.A. Williams, S.H. Williams, M. Witherell, R.J. Wilson, G. Word, S. Yellin, and H. Yuta
Published: 2002
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40. Initial performance of the SLD Cherenkov Ring Imaging Detector system

Author: K. Abe, P. Antilogus, D. Aston, K. Baird, A. Bean, T. Bienz, F. Bird, D. Caldwell, M. Cavalli-Sforza, P. Coyle, D. Coyne, S. Dasu, S. Dolinsky, A. d'Oliveira, J. Duboscq, W. Dunwoodie, P. Gagnon, G. Hallewell, K. Hasegawa, J. Huber, P. Jacques, R.A. Johnson, M. Kalelkar, H. Kawahara, Y. Kwon, D.W.G.S. Leith, X. Liu, A. Lu, J. Martinez, L. Mathys, S. McHugh, B. Meadows, D. Muller, T. Nagamine, M. Nussbaum, T.J. Pavel, R. Plano, B. Ratcliff, P. Rensing, A.K.S. Santha, D. Schultz, S. Shapiro, A. Shoup, C. Simopoulos, M. Sokoloff, E. Solodov, P. Stamer, I. Stockdale, F. Suekane, N. Toge, J. Va'vra, J.S. Whitaker, D.A. Williams, S.H. Williams, M. Witherell, R.J. Wilson, G. Word, S. Yellin, and H. Yuta
Published: 2002
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41. Performance tests of the SLD barrel CRID detector components

Author: P.E. Rensing, P. Coyle, J. Duboscq, T. Nagamine, D.C. Schultz, R. J. Wilson, D. Aston, S. McHugh, P.F. Jacques, M. Cavalli-Sforza, B. T. Meadows, G. Hallewell, F. Suekane, T. Bienz, S. L. Shapiro, A. Lu, M. Kalelkar, W. Dunwoodie, S. Dolinsky, F. Bird, Kazuo Hasegawa, S. Dasu, R.J. Plano, D. W. G. S. Leith, A. Bean, R. A. Johnson, B. N. Ratcliff, P. Antilogus, Koji Abe, C. Simopoulos, P. Gagnon, P. E. Stamer, A.K.S. Santha, E. P. Solodov, S. H. Williams, H. Yuta, L. Mathys, N. Toge, A. D'Oliveira, I. Stockdale, J. Huber, G. B. Word, John Scott Whitaker, J. Martinez, D. G. Coyne, M. Nussbaum, H. Kawahara, T.J. Pavel, X. Liu, S. J. Yellin, Michael S. Witherell, J. Va'vra, A. L. Shoup, Yeong-Dae Kwon, K.G. Baird, David A. Williams, D. O. Caldwell, and Dominik Müller
Subjects: Physics, Single electron, Photon, Optics, Physics::Instrumentation and Detectors, business.industry, Detector, Barrel (horology), Calibration, High Energy Physics::Experiment, business, Electron drift, Anode
Abstract: Summary form only given. The SLAC Large Detector (SLD) barrel Cerenkov ring imaging detector (CRID) is now complete and has participated in SLD data runs. Performance tests of the drift boxes and detectors both in the SLD and in separate test stands have been performed. Tests in SLD with the fiber-optic calibration system include the demonstration and measurement of electron drift paths, checks of the anode wire calibration, and the performance of the fiber-optic system in general. Other tests include measurements of the uniformity of TMAE concentration in a drift box and measurements of single electron diffusion and photon feedback in three drift gases. >
Published: 2002
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42. Dalitz Plot Analysis of the DecayD+→K−π+π+and Indication of a Low-Mass ScalarKπResonance

Author: dos Reis Ac, S. M. Yang, J. Magnin, S. Yoshida, K. C. Peng, A. K. Tripathi, S. MayTal-Beck, P.A. Kasper, A.M. Halling, D. A. Sanders, J. C. Anjos, Simon Kwan, K. O'Shaughnessy, L. Perera, S. Takach, H.S. Carvalho, C. James, Alberto Santoro, K. Thorne, A. Álvarez Fernández, N. Witchey, J. Wiener, B. Lundberg, A. J. Slaughter, S. Banerjee, C. Göbel, D. C. Langs, L. M. Cremaldi, E. Wolin, C. Zhang, J.J. Reidy, A. J. Schwartz, D. Mihalcea, S. Radeztsky, R. A. Sidwell, B. Quinn, A. Nguyen, N. W. Reay, J. Leslie, I. Bediaga, A. Napier, G. Herrera, R. Zaliznyak, K. Denisenko, R. H. Milburn, G. Blaylock, M. V. Purohit, de Mello Neto, M. Sheaff, P. Gagnon, J. A. Appel, S. Amato, D. J. Summers, K. Gounder, A.K.S. Santha, N. R. Stanton, D. Yi, T. Carter, R. Weiss-Babai, Solano Salinas Cj, G. F. Fox, C. L. Darling, A. Massafferri, de Miranda Jm, B. T. Meadows, Kevin Stenson, P. R. Burchat, S. Watanabe, R. A. Burnstein, A. Rafatian, A.B. d'Oliveira, E.M. Aitala, G. Hurvits, S. B. Bracker, R. J. Stefanski, N. K. Copty, Sokoloff, Daniel Ashery, H. A. Rubin, and S. Devmal
Subjects: Physics, Particle decay, Particle physics, Pion, Meson, Hadron, General Physics and Astronomy, Resonance, Dalitz plot, Elementary particle, Boson
Abstract: We study the Dalitz plot of the decay ${D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ with a sample of 15090 events from Fermilab experiment E791. Modeling the decay amplitude as the coherent sum of known $K\ensuremath{\pi}$ resonances and a uniform nonresonant term, we do not obtain an acceptable fit. If we allow the mass and width of the ${K}_{0}^{*}(1430)$ to float, we obtain values consistent with those from PDG but the ${\ensuremath{\chi}}^{2}$ per degree of freedom of the fit is still unsatisfactory. A good fit is found when we allow for the presence of an additional scalar resonance, with mass $797\ifmmode\pm\else\textpm\fi{}19\ifmmode\pm\else\textpm\fi{}43\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{\mathrm{c}}^{\mathrm{2}}$ and width $410\ifmmode\pm\else\textpm\fi{}43\ifmmode\pm\else\textpm\fi{}87\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{\mathrm{c}}^{2}$. The mass and width of the ${K}_{0}^{*}(1430)$ become $1459\ifmmode\pm\else\textpm\fi{}7\ifmmode\pm\else\textpm\fi{}5\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{\mathrm{c}}^{\mathrm{2}}$ and $175\ifmmode\pm\else\textpm\fi{}12\ifmmode\pm\else\textpm\fi{}12\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{\mathrm{c}}^{\mathrm{2}}$, respectively. Our results provide new information on the scalar sector in hadron spectroscopy.
Published: 2002
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43. Differential cross sections, charge production asymmetry, and spin-density matrix elements for D*(2010) produced in 500 GeV/c pi^- nucleon interactions

Author: J.J. Reidy, A. J. Slaughter, R. A. Burnstein, Kevin Stenson, A. Rafatian, J. A. Appel, R. Zaliznyak, D. J. Summers, K. Gounder, J. M. De Miranda, G. Hurvits, C. James, P.A. Kasper, N. R. Stanton, A. Massafferri, A. Nguyen, C. Zhang, C. J. Solano Salinas, M. V. Purohit, S. MayTal-Beck, K. O'Shaughnessy, B. T. Meadows, J. R. T. de Mello Neto, M. D. Sokoloff, P. R. Burchat, A.M. Halling, S. M. Yang, N. Witchey, A.K.S. Santha, H.S. Carvalho, N. W. Reay, J. Leslie, A.K. Tripathi, S. Yoshida, A. Fernandez, J. Magnin, Alberto Santoro, S. Takach, D. C. Langs, J. C. Anjos, T. Carter, S. B. Bracker, Simon Kwan, G. F. Fox, G. Blaylock, K. C. Peng, R. H. Milburn, P. Gagnon, R. A. Sidwell, S. Radeztsky, M. Sheaff, B. Quinn, S. Watanabe, B. Lundberg, Sudeshna Banerjee, C. L. Darling, A. J. Schwartz, I. Bediaga, D. Mihalcea, S. Amato, A. C. dos Reis, L. M. Cremaldi, E. Wolin, A.B. d'Oliveira, E.M. Aitala, D. A. Sanders, G. Herrera, K. Thorne, S. Devmal, L.P. Perera, A. Napier, K. Denisenko, D. Yi, R. Weiss-Babai, J. Wiener, C. Göbel, N. K. Copty, R. J. Stefanski, Daniel Ashery, and H. A. Rubin
Subjects: Physics, Scattering cross-section, Nuclear and High Energy Physics, media_common.quotation_subject, FOS: Physical sciences, Polarization (waves), Asymmetry, High Energy Physics - Experiment, Nuclear physics, symbols.namesake, High Energy Physics - Experiment (hep-ex), Transverse momentum, symbols, Feynman diagram, High Energy Physics::Experiment, Fermilab, Atomic physics, Spin density, Nucleon, Nuclear Experiment, media_common
Abstract: We report differential cross sections for the production of D*(2010) produced in 500 GeV/c pi^- nucleon interactions from experiment E791 at Fermilab, as functions of Feynman-x (x_F) and transverse momentum squared (p_T^2). We also report the D* +/- charge asymmetry and spin-density matrix elements as functions of these variables. Investigation of the spin-density matrix elements shows no evidence of polarization. The average values of the spin alignment are \eta= 0.01 +- 0.02 and -0.01 +- 0.02 for leading and non-leading particles, respectively., Comment: LaTeX2e (elsart.cls). 13 pages, 6 figures (eps files). Submitted to Physics Letters B
Published: 2002

44. Study of the decayD0→K−K−K+π+

Author: N. Witchey, D.C. Langs, J. A. Appel, S. Devmal, C. Zhang, A. Álvarez Fernández, D. A. Sanders, S. M. Yang, Michael Sokoloff, S. Yoshida, S. Takach, L. M. Cremaldi, E. Wolin, K. O'Shaughnessy, L.P. Perera, R. Zaliznyak, Kevin Stenson, J. C. Anjos, D. Mihalcea, A. M. Halling, Daniel Ashery, A. Napier, P.A. Kasper, G. F. Fox, A. C. dos Reis, S. Radeztsky, K. Denisenko, D. Yi, R. Weiss-Babai, J. Lichtenstadt, K. Thorne, S. Banerjee, S. B. Bracker, D. J. Summers, M. V. Purohit, A. Nguyen, S. Watanabe, K. Gounder, J. M. De Miranda, K. C. Peng, A.B. d'Oliveira, E.M. Aitala, R. H. Milburn, A.K.S. Santha, N. K. Copty, B. Quinn, T. Carter, C. James, J. Solano, P. Gagnon, A. J. Slaughter, J. R. T. de Mello Neto, S. Amato, J. Wiener, N. W. Reay, J. Leslie, M. Sheaff, R. J. Stefanski, C. Göbel, R. A. Sidwell, C. L. Darling, H. A. Rubin, A. J. Schwartz, S. Kwan, S. MayTal-Beck, S. Gerzon, G. Herrera, A.K. Tripathi, B. T. Meadows, P. R. Burchat, J.J. Reidy, R. A. Burnstein, I. Bediaga, A. Rafatian, H.S. Carvalho, B. Lundberg, G. Hurvits, Alberto Santoro, G. Blaylock, and N. R. Stanton
Subjects: Physics, Nuclear and High Energy Physics, chemistry, Vacuum state, Analytical chemistry, Pi, chemistry.chemical_element, Platinum, Carbon
Published: 2001
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45. Direct measurement of the pion valence-quark momentum distribution, the pion light-cone wave function squared

Author: A. Napier, K. Denisenko, D. Yi, R. Weiss-Babai, R. A. Burnstein, J. Wiener, A. Rafatian, L.P. Perera, A. J. Schwartz, B. Lundberg, A.M. Halling, C. Göbel, N. R. Stanton, G. Hurvits, N. W. Reay, A. J. Slaughter, J. Leslie, S. Radeztsky, A. Nguyen, G. Herrera, Alberto Santoro, S. Gerzon, J. A. Appel, R. A. Sidwell, B. T. Meadows, A. Álvarez Fernández, Kevin Stenson, L. M. Cremaldi, E. Wolin, D. J. Summers, K. Gounder, J. M. De Miranda, Daniel Ashery, H. A. Rubin, Simon Kwan, N. Witchey, D.C. Langs, M. V. Purohit, P. Gagnon, D. A. Sanders, R. H. Milburn, Sudeshna Banerjee, P.A. Kasper, A.K.S. Santha, N. K. Copty, K. Thorne, K. C. Peng, S. Takach, S. Amato, J. C. Anjos, I. Bediaga, M. Sheaff, G. F. Fox, G. Blaylock, R. Zaliznyak, A.B. d'Oliveira, E.M. Aitala, C. L. Darling, S. Watanabe, J. R. T. de Mello Neto, D. Mihalcea, H.S. Carvalho, A. C. dos Reis, S. Deval, Michael Sokoloff, J. Lichtenstadt, K. O'Shaughnessy, S. M. Yang, S. Yoshida, B. Quinn, S. MayTal-Beck, A.K. Tripathi, S. B. Bracker, J. Solano, J.J. Reidy, Patricia R. Burchat, T. Carter, R. J. Stefanski, C. Zhang, and C. James
Subjects: Quark, Physics, Particle physics, Valence (chemistry), General Physics and Astronomy, FOS: Physical sciences, Square (algebra), High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, Light cone, Transverse momentum, High Energy Physics::Experiment, Fermilab, Wave function, Nuclear Experiment
Abstract: We present the first direct measurements of the pion valence quark momentum distribution which is related to the square of the pion light-cone wave function. The measurements were carried out using data on diffractive dissociation of 500 GeV/c $��^-$ into di-jets from a platinum target at Fermilab experiment E791. The results show that the $|q\bar {q}>$ light-cone asymptotic wave function, which was developed using perturbative QCD methods, describes the data well for $Q^2 \sim 10 ~{\rm (GeV/c)^2}$ or more. We also measured the transverse momentum distribution of the diffractive di-jets., 13 pages, 4 figures
Published: 2000

46. Observation of color-transparency in diffractive dissociation of pions

Author: R. H. Milburn, C. Zhang, S. B. Bracker, A. Nguyen, P. Gagnon, C. L. Darling, D. J. Summers, B. Lundberg, K. Gounder, J. M. De Miranda, R. A. Burnstein, Kevin Stenson, A. Álvarez Fernández, A. Napier, K. Denisenko, A. Rafatian, G. Blaylock, L. M. Cremaldi, E. Wolin, M. V. Purohit, B. Quinn, D. Yi, D. C. Langs, R. Weiss-Babai, S. Gerzon, A.K.S. Santha, J. Wiener, S. M. Yang, G. Hurvits, A. J. Schwartz, P.A. Kasper, J.J. Reidy, R. J. Stefanski, S. Yoshida, M. Sheaff, C. James, C. Göbel, K. O'Shaughnessy, Daniel Ashery, A. J. Slaughter, J. R. T. de Mello Neto, D. A. Sanders, B. T. Meadows, S. Radeztsky, Alberto Santoro, L. Perera, M. D. Sokoloff, H. A. Rubin, K. C. Peng, N. K. Copty, G. Herrera, K. Thorne, S. Banerjee, T. Carter, J. C. Anjos, R. Zaliznyak, J. Solano, N. Witchey, N. R. Stanton, S. MayTal-Beck, H.S. Carvalho, I. Bediaga, A.B. d'Oliveira, E.M. Aitala, S. Devmal, R. A. Sidwell, Patricia R. Burchat, S. Amato, G. F. Fox, A. K. Tripathi, S. Watanabe, A.M. Halling, S. Takach, N. W. Reay, J. Leslie, Simon Kwan, J. A. Appel, D. Mihalcea, A. C. dos Reis, and J. Lichtenstadt
Subjects: Physics, Particle physics, Scattering, General Physics and Astronomy, Sigma, chemistry.chemical_element, Parameterized complexity, FOS: Physical sciences, Dissociation (chemistry), High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, chemistry, Transverse momentum, Color transparency, High Energy Physics::Experiment, Platinum, Nuclear Experiment
Abstract: We have studied the diffractive dissociation into di-jets of 500 GeV/c pions scattering coherently from carbon and platinum targets. Extrapolating to asymptotically high energies (where t_{min} approaches 0) we find that when the per-nucleus cross-section for this process is parameterized as $\sigma = \sigma_0 A^{\alpha}, \alpha$ has values near 1.6, the exact result depending on jet transverse momentum. These values are in agreement with those predicted by theoretical calculations of color-transparency., Comment: 9 pages, 3 figures
Published: 2000
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47. Measurements of Lifetimes and a Limit on the Lifetime Difference in the Neutral D-Meson System

Author: A. J. Schwartz, Kevin Stenson, N. K. Copty, D. J. Summers, K. Gounder, J. M. De Miranda, S. M. Yang, G. Blaylock, G. Herrera, J. R. T. de Mello Neto, A.M. Halling, N. Witchey, S. Yoshida, J. Solano, A.B. d'Oliveira, E.M. Aitala, T. Carter, G. F. Fox, A. Napier, K. Denisenko, S. Banerjee, H.S. Carvalho, D. Yi, R. Zaliznyak, K. O'Shaughnessy, Alberto Santoro, P.A. Kasper, R. Weiss-Babai, S. Watanabe, R. H. Milburn, S. Takach, Daniel Ashery, A. J. Slaughter, H. A. Rubin, A. Álvarez Fernández, P. Gagnon, B. Quinn, D. C. Langs, S. B. Bracker, N. W. Reay, J. Leslie, S. Amato, B. T. Meadows, L. M. Cremaldi, E. Wolin, M. D. Sokoloff, A. Nguyen, C. L. Darling, M. V. Purohit, J. Wiener, J. A. Appel, A.K.S. Santha, C. Göbel, R. J. Stefanski, J. C. Anjos, I. Bediaga, R. A. Burnstein, B. Lundberg, N. R. Stanton, Simon Kwan, A. Rafatian, D. A. Sanders, L. Perera, M. Sheaff, G. Hurvits, K. Thorne, S. Radeztsky, R. A. Sidwell, Patricia R. Burchat, A. K. Tripathi, K. C. Peng, C. James, C. Zhang, D. Mihalcea, A. C. dos Reis, S. MayTal-Beck, and J.J. Reidy
Subjects: Physics, Particle decay, Crystallography, Particle physics, High Energy Physics - Experiment (hep-ex), Meson, D meson, General Physics and Astronomy, FOS: Physical sciences, State (functional analysis), High Energy Physics - Experiment
Abstract: Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we report the first directly measured constraint on the decay-width difference Delta Gamma for the mass eigenstates of the D0-D0bar system. We obtain our result from lifetime measurements of the decays D0 --> K-pi+ and D0 --> K-K+, under the assumption of CP invariance, which implies that the CP eigenstates and the mass eigenstates are the same. The lifetime of D0 --> K-K+ (the CP-even final state is ��_KK = 0.410 +/- 0.011 +/- 0.006 ps, and the lifetime of D0 --> K-pi+ (an equal mixture of CP-odd and CP-even final states is tau_Kpi = 0.413 +/- 0.003 +/- 0.004 ps. The decay-width difference is Delta Gamma = 2(Gamma_KK - Gamma_Kpi) = 0.04 +/- 0.14 +/- 0.05 ps^-1. We relate these measurements to measurements of mixing in the neutral D-meson system., 8 pages + 3 figures + 2 tables
Published: 1999
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48. Search for Rare and Forbidden Dilepton Decays of the D+, Ds, and D0 Charmed Mesons

Author: E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, S. Devmal, A. Fernandez, G.F. Fox, P. Gagnon, C. Gobel, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, J. Magnin, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, D. Mihalcea, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, D.A. Sanders, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, J. Solano, N.R. Stanton, R.J. Stefanski, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, S.M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, Muon, Meson, Neutral current, High Energy Physics::Phenomenology, FOS: Physical sciences, Electron, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics::Experiment, Fermilab, Charm (quantum number)
Abstract: We report the results of a search for flavor-changing neutral current, lepton-flavor violating, and lepton-number violating decays of D+, Ds, and D0 mesons (and their antiparticles) into modes containing muons and electrons. Using data from Fermilab charm hadroproduction experiment E791, we examine the pi,l,l and K,l,l decay modes of D+ and Ds and the l+l- decay modes of D0. No evidence for any of these decays is found. Therefore, we present branching-fraction upper limits at 90% confidence level for the 24 decay modes examined. Eight of these modes have no previously reported limits, and fourteen are reported with significant improvements over previously published results., Comment: 12 pages, 3 figures, LaTeX, elsart.cls, epsf.sty, amsmath.sty Submitted to Physics Letters B
Published: 1999
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49. The endcap Cherenkov Ring Imaging Detector at SLD

Author: Dwg Leith, T.J. Pavel, X. Liu, S. Manly, S. Willocq, J. Martinez, Robert Wilson, T. Weber, M. Dima, D.C. Schultz, G. Muller, J. A. Coller, C. Baltay, J. D. Turk, Michael Sokoloff, D. Aston, A. Lu, M. Nussbaum, Koji Abe, P.F. Jacques, T. Nagamine, G. Hallewell, Y. Iwasaki, Dominik Müller, Yukio Hasegawa, F. Bird, P. Stamer, A. Bean, Yeong-Dae Kwon, J. Huber, T. Bienz, S. H. Williams, N. Toge, D. G. Coyne, K.G. Baird, David A. Williams, W. Dunwoodie, A.B. d'Oliveira, R. Ben-David, S. Sen, M. Kalelkar, S. Dolinsky, J. S. Whitaker, R. A. Johnson, S. L. Shapiro, S. J. Yellin, P.E. Rensing, P. Antilogus, J. Duboscq, P. Coyle, J Snyder, A.K.S. Santha, J. Va'vra, F. Suekane, Brian Meadows, R.J. Plano, James Shank, S. McHugh, David O. Caldwell, M. Cavalli-Sforza, G. B. Word, E. P. Solodov, H. Yuta, L. Mathys, I. Stockdale, Kazuo Hasegawa, B. Ratcliffe, H. Kawahara, and C. Simopoulos
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Particle accelerator, Ring (chemistry), Particle detector, Particle identification, law.invention, Nuclear physics, Nuclear Energy and Engineering, law, High Energy Physics::Experiment, Electrical and Electronic Engineering, Detectors and Experimental Techniques, Cherenkov radiation
Abstract: We present the Cherenkov ring imaging detector in the endcap regions of the SLD detector and report initial performance. The endcap CRID was completed and commissioned in 1993 and is fully operational for the 1994 run. First Cherenkov rings have been observed. The endcap CRID detectors and fluid systems are described and initial operational experience is discussed. >
Published: 1995

50. Recent results from Fermilab E791

Author: S. B. Bracker, Daniel Ashery, T. Dubbs, N. R. Stanton, M. Aryal, H. A. Rubin, A. J. Slaughter, S. Watanabe, C. Zhang, T. Carter, J. Wiener, D. C. Langs, R. Weiss, S. MayTal-Beck, S. Radeztsky, A. Nguyen, A. Napier, K. Denisenko, D. Yi, M. V. Purohit, A.K.S. Santha, M. Sheaff, B. T. Meadows, M. D. Sokoloff, J. G. Smith, B. P. Quinn, A. C. dos Reis, J.J. Reidy, Ignacio Bediaga, B. Lundberg, Hermes Carvalho, D. J. Summers, R. A. Sidwell, I. Costa, S. Amato, J. Lichtenstadt, K. Gounder, L. Perera, J. M. De Miranda, K. Thorne, A.B. d'Oliveira, E.M. Aitala, G. Hurwitz, A. Álvarez Fernández, L. M. Cremaldi, E. Wolin, J. R. T. de Mello Neto, Patricia R. Burchat, J. A. Appel, A. K. Tripathi, K. C. Peng, D. Granite, M. Halling, N. Witchey, C. James, S. Takach, P.A. Kasper, A. J. Schwartz, P. Gagnon, G. Herrera, R. Zaliznyak, S. Gerson, N. W. Reay, C. L. Darling, J. Leslie, R. H. Milburn, Simon Kwan, K. O'Shaughnessy, Alberto Santoro, R. A. Burnstein, A. Rafatian, J. C. Anjos, G. Blaylock, K. Sugano, and S. Banerjee
Subjects: Nuclear physics, Physics, Particle decay, Pion, Meson, Branching fraction, Flavor-changing neutral current, High Energy Physics::Experiment, Charm (quantum number), Fermilab, Lepton
Abstract: Fermilab E791 is a high statistics charm experiment using a 500 GeV/c π− beam incident on a segmented target. We present results based on one third of the 1991‐1992 data, with particular emphasis on a search for the flavor changing neutral current decay D+→π+μ+μ−.
Published: 1995
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